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Allowance for doubtfull receivables


	December 31, 2017		December 31, 2016
Cash on hand and at banks	$	127,625	$	126,584
Short-term deposits and highly liquid funds		7		9,408
Cash and cash equivalents	$	127,632	$	135,992

Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2017

ACCOUNTS RECEIVABLE,NET [Abstract]

Accounts receivable, net

	December 31, 2017		December 31, 2016
Accounts receivable	$	80,037	$	85,266
Less: provision for doubtful receivables		(19,706)		(19,437)
Accounts receivable, net	$	60,331	$	65,829


Allowance for doubtful receivables	Balance at Beginning of Period		Charges to Costs and Expenses		Amount Utilized		Balance at End of Period
Year ended December 31, 2015	$	(18,464)	$	(59)	$	245	$	(18,278)
Year ended December 31, 2016	$	(18,278)	$	(1,304)	$	145	$	(19,437)
Year ended December 31, 2017	$	(19,437)	$	(269)	$	—	$	(19,706)

Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2017

PREPAID EXPENSES AND OTHER CURRENT ASSETS [Abstract]

Prepaid expenses and other current assets


	December 31, 2017		December 31, 2016
Prepaid voyage and operating costs	$	8,022	$	8,352
Claims receivable		12,307		9,822
Prepaid other taxes		4,520		4,279
Advances for working capital purposes		18		4,486
Other		2,516		1,957
Total prepaid expenses and other current assets	$	27,383	$	28,896

Vessels, Port Terminal and Other Fixed Assets, Net (Tables)

12 Months Ended

Dec. 31, 2017

Total


Vessels	Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2014	$	1,841,140	$	(376,794)	$	1,464,346
Additions		—		(70,894)		(70,894)
Balance December 31, 2015		1,841,140		(447,688)		1,393,452
Additions		60,115		(73,847)		(13,732)
Transfers		29,695		—		29,695
Balance December 31, 2016		1,930,950		(521,535)		1,409,415
Additions		—		(73,017)		(73,017)
Impairment losses		(104,157)		58,034		(46,123)
Disposals		(11,828)		—		(11,828)
Balance December 31, 2017	$	1,814,965	$	(536,518)	$	1,278,447

Port Terminals (Navios Logistics)	Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2014	$	106,399	$	(20,467)	$	85,932
Additions		2,287		(3,431)		(1,144)
Balance December 31, 2015		108,686		(23,898)		84,788
Additions		2,051		(3,493)		(1,442)
Transfers		(1,513)		—		(1,513)
Balance December 31, 2016		109,224		(27,391)		81,833
Additions		5,060		(5,237)		(177)
Transfers from deposits for vessels, port terminals and other fixed assets		137,357		—		137,357
Balance December 31, 2017	$	251,641	$	(32,628)	$	219,013


Tanker vessels, barges and pushboats (Navios Logistics)	Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2014	$	464,966	$	(111,137)	$	353,829
Additions		6,188		(20,007)		(13,819)
Restructure of capital lease		(210)		—		(210)
Balance December 31, 2015		470,944		(131,144)		339,800
Additions		738		(18,894)		(18,156)
Transfers		3,696		—		3,696
Balance December 31, 2016		475,378		(150,038)		325,340
Additions		5,531		(17,603)		(12,072)
Disposals		(3,585)		3,585		—
Revaluation of vessels due to termination of capital lease obligation		(5,243)		—		(5,243)
Balance December 31, 2017	$	472,081	$	(164,056)	$	308,025


Other fixed assets	Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2014	$	13,426	$	(6,390)	$	7,036
Additions		443		(1,558)		(1,115)
Balance December 31, 2015		13,869		(7,948)		5,921
Additions		2,250		(1,475)		775
Transfers		(2,183)		—		(2,183)
Balance December 31, 2016		13,936		(9,423)		4,513
Additions		531		(1,257)		(726)
Disposals		(75)		28		(47)
Write offs		(32)		32		—
Balance December 31, 2017	$	14,360	$	(10,620)	$	3,740


Total	Cost		Accumulated Depreciation		Net Book Value
Balance December 31, 2014	$	2,425,931	$	(514,788)	$	1,911,143
Additions		8,918		(95,890)		(86,972)
Restructure of capital lease		(210)		—		(210)
Balance December 31, 2015		2,434,639		(610,678)		1,823,961
Additions		65,154		(97,709)		(32,555)
Transfers		29,695		—		29,695
Balance December 31, 2016		2,529,488		(708,387)		1,821,101
Additions		11,122		(97,114)		(85,992)
Impairment losses		(104,157)		58,034		(46,123)
Disposals		(15,488)		3,613		(11,875)
Write offs		(32)		32		—
Revaluation of vessels due to termination of capital lease obligation		(5,243)		—		(5,243)
Transfers from deposits for vessels, port terminals and other fixed assets		137,357		—		137,357
Balance December 31, 2017	$	2,553,047	$	(743,822)	$	1,809,225

Intangible Assets/Liabilities Other Than Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

INTANGIBLE ASSETS/LIABILITIES OTHER THAN GOODWILL [Abstract]

Schedule of intangible assets


	Acquisition Cost		Accumulated Amortization		Write off		Net Book Value December 31, 2017
Trade name	$	100,420	$	(45,156)	$	—	$	55,264
Port terminal operating rights		53,152		(10,889)		—		42,263
Customer relationships		35,490		(17,745)		—		17,745
Favorable lease terms(*)		11,548		—		(10,398)		1,150
Total Intangible assets	$	200,610	$	(73,790)	$	(10,398)	$	116,422

Net Book Value of Intangible Assets/Liabilities other than Goodwill as at December 31, 2016


	Acquisition Cost		Accumulated Amortization		Write off		Net Book Value December 31, 2016
Trade name	$	100,420	$	(41,303)	$	—	$	59,117
Port terminal operating rights		53,152		(10,162)		—		42,990
Customer relationships		35,490		(15,971)		—		19,519
Favorable lease terms(*)		82,485		(6,359)		(70,937)		5,189
Total Intangible assets		271,547		(73,795)		(70,937)		126,815
Unfavorable lease terms(**)		(24,721)		—		24,721		—
Total	$	246,826	$	(73,795)	$	(46,216)	$	126,815

(*)

(**)

Amortization expense


	Amortization Expense and Write Offs Year Ended December 31, 2017		Amortization Expense and Write Offs Year Ended December 31, 2016		Amortization Expense and Write Offs Year Ended December 31, 2015
Trade name	$	3,853	$	3,902	$	3,811
Port terminal operating rights		727		706		1,006
Customer relationships		1,775		1,775		1,775
Favorable lease terms		4,038		17,260		32,444
Unfavorable lease terms		—		(7,526)		(14,615)
Total	$	10,393	$	16,117	$	24,420

Schedule of aggregate amortization expense


Description	Within one year		Year Two		Year Three		Year Four		Year Five		Thereafter		Total
Trade name	$	2,811	$	2,811	$	2,818	$	2,811	$	2,811	$	41,202	$	55,264
Port terminal operating rights		985		985		985		985		985		37,338		42,263
Customer relationships		1,775		1,775		1,775		1,775		1,775		8,870		17,745
Total amortization	$	5,571	$	5,571	$	5,578	$	5,571	$	5,571	$	87,410	$	115,272

Investments in affiliates and investments in available-for-sale securities (Tables)

12 Months Ended

Dec. 31, 2017

INVESTMENTS IN AFFILIATES AND INVESTMENTS IN AVAILABLE-FOR-SALE SECURITIES [Abstract]

Financial information of affiliate companies, balance sheet


	December 31, 2017								December 31, 2016
Balance Sheet	Navios Partners		Navios Europe I		Navios Europe II		Navios Containers		Navios Partners		Navios Europe I		Navios Europe II
Cash and cash equivalents, including restricted cash	$	29,933	$	19,185	$	16,882	$	14,501	$	25,088	$	10,785	$	16,916
Current assets		60,306		22,417		28,403		21,371		56,349		15,980		19,487
Non-current assets		1,244,996		145,940		195,784		245,440		1,212,231		169,925		232,363
Current liabilities		54,247		21,284		25,805		49,559		98,950		18,490		24,126
Long- term debt including current portion, net		493,463		75,472		109,223		119,033		523,776		86,060		119,234
Non-current liabilities		483,345		125,283		164,276		76,534		489,421		155,387		184,530

Financial information of affiliate companies, income statement


	December 31, 2017												December 31, 2016									December 31, 2015
Income Statement	Navios Partners		Navios Europe I			Navios Europe II			Navios Containers			Navios Partners			Navios Europe I			Navios Europe II			Navios Partners					Navios Europe I			Navios Europe II
Revenue	$	211,652		$	37,468		$	38,633		$	39,188		$	190,524		$	40,589		$	30,893			$	223,676	$		41,437	$		20,767
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II	$	(15,090)		$	(20,778)		$	22,749		$	2,638		$	(52,549)		$	(2,174)		$	(25,062)			$	41,805	$		(1,347)	$		1,673
Net (loss)/income	$	(15,090)		$	9,762		$	(9,086)		$	2,638		$	(52,549)		$	16,137		$	(34,059)			$	41,805	$		(1,118)	$		77,252

Accrued Expenses and Other Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

ACCRUED EXPENSES AND OTHER LIABILITIES [Abstract]

Accrued expenses and Other Liabilities


	December 31, 2017		December 31, 2016
Payroll	$	18,889	$	14,730
Accrued interest		32,555		36,273
Accrued voyage expenses		4,843		2,217
Accrued running costs		23,812		21,394
Provision for estimated losses on vessels under time charter		2,631		3,129
Audit fees and related services		364		266
Accrued taxes		5,376		5,092
Professional fees		2,236		1,707
Other accrued expenses		4,153		6,941
Total accrued expenses	$	94,859	$	91,749

Borrowings (Tables)

12 Months Ended

Dec. 31, 2017

BORROWINGS [Abstract]

Loans' outstanding amounts


Navios Holdings borrowings	December 31, 2017		December 31, 2016
Commerzbank A.G. ($240,000)	$	—	$	19,857
HSH Nordbank ($15,300)		14,535		—
Loan Facility Credit Agricole ($40,000)		17,674		18,880
Loan Facility Credit Agricole ($23,000)		14,074		14,755
Loan Facility Credit Agricole ($23,000)		14,450		15,150
Loan Facility DVB Bank SE ($72,000)		50,140		54,540
Loan Facility DVB Bank SE ($41,000)		33,816		37,293
Loan Facility Credit Agricole ($22,500)		15,188		16,313
Loan Facility DVB Bank SE ($40,000)		18,254		28,000
Loan Facility Alpha Bank ($31,000)		25,600		27,400
Loan Facility Alpha Bank ($16,125)		16,125		16,125
Navios Acquisition Loan		—		51,240
2019 Notes		—		291,094
2022 Senior Secured Notes		305,000		—
2022 Notes		650,000		650,000
Total Navios Holdings borrowings	$	1,174,856	$	1,240,647


Navios Logistics borrowings	December 31, 2017		December 31, 2016
2022 Logistics Senior Notes	$	375,000	$	375,000
Navios Logistics Notes Payable		31,109		34,447
Navios Logistics BBVA Loan Facility		23,250		25,000
Navios Logistics Alpha Bank Loan		13,300		—
Navios Logistics Term Loan B Facility		100,000		—
Other long-term loans		253		321
Total Navios Logistics borrowings	$	542,912	$	434,768


Total	December 31, 2017		December 31, 2016
Total borrowings	$	1,717,768	$	1,675,415
Less: current portion, net		(33,885)		(29,827)
Less: deferred finance costs and discount, net		(35,280)		(24,320)
Total long-term borrowings	$	1,648,603	$	1,621,268

Principal payments


Year
2018	$	35,988
2019		33,326
2020		71,454
2021		154,825
2022		1,414,638
2023 and thereafter		7,537
Total	$	1,717,768

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

FAIR VALUE OF FINANCIAL INSTRUMENTS [abstract]

Fair value of financial instruments

	December 31, 2017				December 31, 2016
	Book Value		Fair Value		Book Value		Fair Value
Cash and cash equivalents	$	127,632	$	127,632	$	135,992	$	135,992
Restricted cash	$	6,558	$	6,558	$	5,386	$	5,386
Investments in available-for-sale-securities	$	238	$	238	$	—	$	—
Loan receivable from affiliate companies	$	30,112	$	30,112	$	23,008	$	23,008
Long-term receivable from affiliate companies	$	—	$	—	$	11,105	$	11,105
Capital lease obligations, including current portion	$	—	$	—	$	(17,617)	$	(17,617)
Senior and ship mortgage notes, net	$	(1,301,999)	$	(1,181,838)	$	(1,296,537)	$	(974,170)
Long-term debt, including current portion	$	(380,489)	$	(389,332)	$	(304,682)	$	(308,080)
Loan payable to affiliate company	$	—	$	—	$	(49,876)	$	(51,240)
Long-term payable to affiliate companies	$	(76,872)	$	(76,872)	$	(6,399)	$	(6,399)

Fair value measurements on a recurring basis


	Fair Value Measurements as of December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level I)		Significant Other Observable Inputs (Level II)		Significant Unobservable Inputs (Level III)
Investments in available-for-sale-securities	$	238	$	238	$	—	$	—

Total	$	238	$	238	$	—	$	—

Fair value measurements on a nonrecurring basis


	Fair Value Measurements as of December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level I)		Significant Other Observable Inputs (Level II)		Significant Unobservable Inputs (Level III)
Vessels, port terminals and other fixed assets, net	$	16,500	$	—	$	16,500	$	—


	Fair Value Measurements as of December 31, 2016
	Total		Quoted Prices in Active Markets for Identical Assets (Level I)		Significant Other Observable Inputs (Level II)		Significant Unobservable Inputs (Level III)
Investments in affiliates	$	148,095	$	148,095	$	—	$	—

Fair value measurements on a nonrecurring basis


	Fair Value Measurements at December 31, 2017
	Total		(Level I)			(Level II)			(Level III)
Cash and cash equivalents	$	127,632		$	127,632		$	—		$	—
Restricted cash	$	6,558		$	6,558		$	—		$	—
Investments in available-for-sale-securities	$	238		$	238		$	—		$	—
Loan receivable from affiliate companies(2)	$	30,112		$	—		$	30,112		$	—
Senior and ship mortgage notes	$	(1,181,838)		$	(1,181,838)		$	—		$	—
Long-term debt, including current portion(1)	$	(389,332)		$	—		$	(389,332)		$	—
Long-term payable to affiliate companies(2)	$	(76,872)		$	—		$	(76,872)		$	—


	Fair Value Measurements at December 31, 2016
	Total		(Level I)		(Level II)		(Level III)
Cash and cash equivalents	$	135,992	$	135,992	$	—	$	—
Restricted cash	$	5,386	$	5,386	$	—	$	—
Loan receivable from affiliate company(2)	$	23,008	$	—	$	23,008	$	—
Long-term receivable from affiliate companies (2)	$	11,105	$	—	$	11,105	$	—
Capital lease obligations, including current portion (1)	$	(17,617)	$	—	$	(17,617)	$	—
Senior and ship mortgage notes	$	(974,170)	$	(974,170)	$	—	$	—
Long-term debt, including current portion(1)	$	(308,080)	$	—	$	(308,080)	$	—
Loan payable to affiliate company(2)	$	(51,240)	$	—	$	(51,240)	$	—
Long-term payable to affiliate companies(2)	$	(6,399)	$	—	$	(6,399)	$	—

(1)	The fair value of the Company’s long-term debt/ Capital lease obligations is estimated based on currently available debt with similar contract terms, interest rates and remaining maturities, published quoted market prices as well as taking into account the Company’s creditworthiness.
(2)	The fair value of the Company’s loan receivable from/ payable to affiliate companies and long-term receivable from/payable to affiliate companies is estimated based on currently available debt with similar contract terms, interest rate and remaining maturities as well as taking into account the counterparty’s creditworthiness.

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

EMPLOYEE BENEFIT PLANS [Abstract]

Summary of stock based awards


	Shares			Weighted average exercise price		Weighted average remaining term		Aggregate fair value
Options
Outstanding as of December 31, 2014		5,804,594		$	4.57		4.64	$	8,410
Vested at December 31, 2014		1,643,665			—		—		—
Exercisable at December 31, 2014		1,500,476			—		—		—
Forfeited or expired		(159,828	)		—		—		(193	)
Granted		1,000,000			1.2		—		552
Outstanding as of December 31, 2015		6,644,766		$	4.09		4.23	$	8,769
Vested at December 31, 2015		730,592			—		—		—
Exercisable at December 31, 2015		730,592			—		—		—
Forfeited or expired		(348,520	)		—		—		—
Granted		2,500,000			1.2		—		—
Outstanding as of December 31, 2016		8,796,246		$	3.20		4.41	$	9,804
Vested at December 31, 2016		1,210,824			—		—		—
Exercisable at December 31, 2016		1,210,824			—		—		—
Forfeited or expired		(891,670)			—		—		—
Granted		—			—		—		—
Outstanding as of December 31, 2017		7,904,576		$	2.98		3.80	$	7,539
Restricted stock and restricted stock units
Non Vested as of December 31, 2014		1,997,344		$	—		2.00	$	10,899
Granted		2,540,000			—		—		3,048
Vested		(812,847	)		—		—		(5,746	)
Forfeited or expired		(3,538	)		—		—		(15	)
Non Vested as of December 31, 2015		3,720,959		$	—		2.45	$	8,186
Granted		2,540,000			—		—		3,048
Vested		(1,755,017	)		—		—		(5,122	)
Forfeited or expired		(3,408	)		—		—		(12	)
Non Vested as of December 31, 2016		4,502,534		$	—		2.55	$	6,100
Granted		4,353,975			—		—		42
Vested		(1,839,195)			—		—		(2,630	)
Forfeited or expired		—			—		—		—
Non Vested as of December 31, 2017		7,017,314		$	—		3.21	$	3,512

Leases (Tables)

12 Months Ended

Dec. 31, 2017

LEASES [Abstract]

Chartered-in vessels, barges, pushboats and office space


	Charter-in vessels in operation		Charter-in vessels to be delivered			Office space
2018	$	119,023	$	8,725	$		1,992
2019		96,048		19,316			1,314
2020		82,638		20,945			509
2021		63,040		10,807			184
2022		43,689		10,109			—
2023 and thereafter		77,828		19,371			—
Total	$	482,266	$	89,273	$		3,999

Chartered-out vessels, barges and pushboats


	Dry bulk vessels		Logistics business
2018	$	35,420	$	138,384
2019		2,458		104,721
2020		—		77,209
2021		—		62,290
2022		—		55,450
2023 and thereafter		—		699,388
Total minimum revenue, net of commissions	$	37,878	$	1,137,442

Interest Expense and Finance Cost (Tables)

12 Months Ended

Dec. 31, 2017

INTEREST EXPENSE AND FINANCE COST [Abstract]

Interest expense and finance cost


	For the Year Ended December 31, 2017		For the Year Ended December 31, 2016		For the Year Ended December 31, 2015
Interest expense	$	115,099	$	107,787	$	108,488
Amortization and write-off of deferred financing costs		6,391		5,653		4,524
Other		121		199		139
Interest expense and finance cost	$	121,611	$	113,639	$	113,151

Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

SEGMENT INFORMATION [Abstract]

Segment summarized financial information


	Dry Bulk Vessel Operations for the Year Ended December 31, 2017		Logistics Business for the Year Ended December 31, 2017		Total for the Year Ended December 31, 2017
Revenue	$	250,433	$	212,616	$	463,049
Administrative fee revenue from affiliates		23,667		—		23,667
Interest income		6,593		238		6,831
Interest expense and finance cost		(93,264)		(28,347)		(121,611)
Depreciation and amortization		(77,245)		(26,867)		(104,112)
Equity/ (Loss) in net earnings of affiliated companies		4,399		—		4,399
Net (loss)/ income attributable to Navios Holdings common stockholders		(167,892)		1,982		(165,910)
Total assets		1,947,777		682,204		2,629,981
Goodwill		56,240		104,096		160,336
Capital expenditures		(347)		(46,521)		(46,868)
Investment in affiliates		183,160		—		183,160
Cash and cash equivalents		47,744		79,888		127,632
Restricted cash		6,558		—		6,558
Long-term debt, net (including current and noncurrent portion)	$	1,149,742	$	532,746	$	1,682,488


	Dry Bulk Vessel Operations for the Year Ended December 31, 2016		Logistics Business for the Year Ended December 31, 2016		Total for the Year Ended December 31, 2016
Revenue	$	199,446	$	220,336	$	419,782
Administrative fee revenue from affiliates		21,799		—		21,799
Interest income		4,132		815		4,947
Interest expense and finance cost		(89,399)		(24,240)		(113,639)
Depreciation and amortization		(87,197)		(26,628)		(113,825)
Equity/ (Loss) in net earnings of affiliated companies		(202,779)		—		(202,779)
Net (loss)/ income attributable to Navios Holdings common stockholders		(310,306)		6,483		(303,823)
Total assets		2,083,526		669,369		2,752,895
Goodwill		56,240		104,096		160,336
Capital expenditures		(60,420)		(91,173)		(151,593)
Investment in affiliates		160,071		—		160,071
Cash and cash equivalents		70,810		65,182		135,992
Restricted cash		2,486		2,900		5,386
Long-term debt, net (including current and noncurrent portion)	$	1,223,146	$	427,949	$	1,651,095


	Dry Bulk Vessel Operations for the Year Ended December 31, 2015		Logistics Business for the Year Ended December 31, 2015		Total for the Year Ended December 31, 2015
Revenue	$	229,772	$	251,048	$	480,820
Administrative fee revenue from affiliates		16,177		—		16,177
Interest income		1,801		569		2,370
Interest expense and finance cost		(86,069)		(27,082)		(113,151)
Depreciation and amortization		(92,341)		(27,969)		(120,310)
Equity in net earnings of affiliated companies		61,484		—		61,484
Net (loss)/ income attributable to Navios Holdings common stockholders		(148,306)		14,194		(134,112)
Total assets		2,359,299		599,514		2,958,813
Goodwill		56,240		104,096		160,336
Capital expenditures		(7,882)		(27,039)		(34,921)
Investment in affiliates		381,746		—		381,746
Cash and cash equivalents		81,905		81,507		163,412
Restricted cash		13,480		—		13,480
Long-term debt, net (including current and noncurrent portion)	$	1,213,740	$	367,568	$	1,581,308

Revenue by geographic region


	Year ended December 31, 2017		Year ended December 31, 2016		Year ended December 31, 2015
North America	$	5,513	$	6,218	$	22,317
Europe		124,857		109,267		109,347
Asia		91,552		73,073		87,658
South America		212,616		220,336		253,746
Other		28,511		10,888		7,752
Total	$	463,049	$	419,782	$	480,820

Loss Per Common Share (Tables)

12 Months Ended

Dec. 31, 2017

LOSS PER COMMON SHARE [Abstract]

Loss per share, basic and diluted


	Year ended December 31, 2017		Year ended December 31, 2016		Year ended December 31, 2015
Numerator:
Net loss attributable to Navios Holdings common stockholders	$	(165,910)	$	(303,823)	$	(134,112)
Declared and undeclared dividend on preferred stock and on unvested restricted shares		(10,421)		(15,909)		(16,202)
Tender Offer – Redemption of preferred stock Series G and H including $972 and $5,063 of undeclared preferred dividend cancelled for the year ended December 31, 2017 and December 31, 2016, respectively		1,033		46,627		—
Loss available to Navios Holdings common stockholders, basic and diluted	$	(175,298)	$	(273,105)	$	(150,314)

Denominator:
Denominator for basic and diluted net loss per share attributable to Navios Holdings stockholders — adjusted weighted shares		116,673,459		107,366,783		105,896,235

Basic and diluted net loss per share attributable to Navios Holdings stockholders	$	(1.50)	$	(2.54)	$	(1.42)

Description of Business (Details) - USD ($) $ in Thousands	5 Months Ended	12 Months Ended
Description of Business (Details) - USD ($) $ in Thousands	Jun. 08, 2017	Dec. 31, 2017
Subsidiary or Equity Method Investee [Line Items]
Trading Symbol		NM
Navios Logistics
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage of Navios Holdings		63.80%
Navios Partners
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage of Navios Holdings		20.80%
General partner interest of Navios Holdings		2.00%
Trading Symbol		NMM
Navios Acquisition
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage of Navios Holdings		46.20%
Percentage of voting stock of Navios Holdings in Navios Acquisition		42.90%
Trading Symbol		NNA
Navios Midstream
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage of Navios Holdings		0.00%
Trading Symbol		NAP
Navios Containers
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage of Navios Holdings		3.40%
Trading Symbol		NMCI
Navios Containers \| Private placement
Subsidiary or Equity Method Investee [Line Items]
Noncontrolling Interest, Increase from Subsidiary Equity Issuance	$ 5,000
Navios Containers \| Warrants
Subsidiary or Equity Method Investee [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		1.70%

Description of Business - Related Parties - Navios Europe I (Table) (Details) - Navios Europe I	12 Months Ended
	Dec. 31, 2017	Oct. 09, 2013
Related Party Transaction [Line Items]
Percentage of ownership	47.50%
Navios Holdings
Related Party Transaction [Line Items]
Percentage of ownership		47.50%
Percentage of voting stock held	50.00%
Navios Acquisition
Related Party Transaction [Line Items]
Percentage of ownership		47.50%
Percentage of voting stock held	50.00%
Navios Partners
Related Party Transaction [Line Items]
Percentage of ownership		5.00%
Percentage of voting stock held	0.00%
Tanker vessels
Related Party Transaction [Line Items]
Number of vessels	5
Container vessels
Related Party Transaction [Line Items]
Number of vessels	5

Description of Business - Related Parties - Navios Europe II (Table) (Details) - Navios Europe II	12 Months Ended
	Dec. 31, 2017	Feb. 18, 2015
Related Party Transaction [Line Items]
Percentage of ownership	47.50%
Navios Holdings
Related Party Transaction [Line Items]
Percentage of ownership		47.50%
Percentage of voting stock held	50.00%
Navios Acquisition
Related Party Transaction [Line Items]
Percentage of ownership		47.50%
Percentage of voting stock held	50.00%
Navios Partners
Related Party Transaction [Line Items]
Percentage of ownership		5.00%
Percentage of voting stock held	0.00%
Dry bulkers vessels
Related Party Transaction [Line Items]
Number of vessels	7
Container vessels
Related Party Transaction [Line Items]
Number of vessels	7

Summary of Significant Accounting Policies - Subsidiaries (Table) (Details)	12 Months Ended
	Dec. 31, 2017
Navios Maritime Holdings Inc.
Entity Information [Line Items]
Nature	Holding Company
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Corporation
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios International Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navimax Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Handybulk Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Hestia Shipping Ltd.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Malta
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Anemos Maritime Holdings Inc.
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Shipmanagement Inc.
Entity Information [Line Items]
Nature	Management Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
NAV Holdings Limited
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Malta
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Kleimar N.V.
Entity Information [Line Items]
Nature	Operating Company/Vessel Owning Company/Management Company
Ownership Interest	100.00%
Country of Incorporation	Belgium
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Kleimar Ltd.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Bulkinvest S.A.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Luxembourg
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Primavera Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Ginger Services Co.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Aquis Marine Corp.
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Tankers Management Inc.
Entity Information [Line Items]
Nature	Management Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Astra Maritime Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Achilles Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Apollon Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Herakles Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Hios Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Ionian Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Kypros Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Meridian Shipping Enterprises Inc.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Mercator Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Arc Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Horizon Shipping Enterprises Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Magellan Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Aegean Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Star Maritime Enterprises Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Corsair Shipping Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Rowboat Marine Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Beaufiks Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Nostos Shipmanagement Corp.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Portorosa Marine Corp.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Shikhar Ventures S.A.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Liberia
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Sizzling Ventures Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Liberia
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Rheia Associates Co.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Taharqa Spirit Corp.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Rumer Holding Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Pharos Navigation S.A.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Pueblo Holdings Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Quena Shipmanagement Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Aramis Navigation Inc.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
White Narcissus Marine S.A.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Panama
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios GP L.L.C.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Red Rose Shipping Corp.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Highbird Management Inc.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Ducale Marine Inc.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Vector Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Faith Marine Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Liberia
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Maritime Finance (US) Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Delaware
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Maritime Finance II (US) Inc.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Delaware
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Tulsi Shipmanagement Co.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Cinthara Shipping Ltd.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Rawlin Services Company
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Mauve International S.A.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Serenity Shipping Enterprises Inc.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Mandora Shipping Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Solange Shipping Ltd.
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Diesis Ship Management Ltd.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Holdings Europe Finance Inc.
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Navios Asia LLC
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Iris Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Jasmine Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Emery Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Lavender Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	1/1 - 12/31
Esmeralda Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/12 - 12/31
Triangle Shipping Corporation
Entity Information [Line Items]
Nature	Vessel Owning Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/12 - 12/31
Roselite Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	10/9 - 12/31
Smaltite Shipping Corporation
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	1/1 - 12/31
2015	10/9 - 12/31
Motiva Trading Ltd
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	1/1 - 12/31
2016	11/2 - 12/31
Alpha Merit Corporation
Entity Information [Line Items]
Nature	Sub-Holding Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	11/3 - 12/31
Thalassa Marine S.A.
Entity Information [Line Items]
Nature	Operating Company
Ownership Interest	100.00%
Country of Incorporation	Marshall Is.
Statement of Operations
2017	12/15 - 12/31

Summary of Significant Accounting Policies - Depreciation Periods (Table) (Details)	12 Months Ended
	Dec. 31, 2017
Vessels
Property Plant And Equipment [Line Items]
Useful life assets	25 years
Port terminals \| Minimum
Property Plant And Equipment [Line Items]
Useful life assets	5 years
Port terminals \| Maximum
Property Plant And Equipment [Line Items]
Useful life assets	40 years
Tanker vessels, barges and pushboats \| Minimum
Property Plant And Equipment [Line Items]
Useful life assets	15 years
Tanker vessels, barges and pushboats \| Maximum
Property Plant And Equipment [Line Items]
Useful life assets	45 years
Furniture, fixtures and equipment \| Minimum
Property Plant And Equipment [Line Items]
Useful life assets	3 years
Furniture, fixtures and equipment \| Maximum
Property Plant And Equipment [Line Items]
Useful life assets	10 years
Computer equipment and software
Property Plant And Equipment [Line Items]
Useful life assets	5 years
Leasehold improvements
Property Plant And Equipment [Line Items]
Useful life assets	shorter of lease term or 6 years

Summary of Significant Accounting Policies - Amortization Periods (Table) (Details)	12 Months Ended
	Dec. 31, 2017
Trade name
Acquired Finite Lived Intangible Assets
Weighted average amortization periods	30 years
Favorable lease terms
Acquired Finite Lived Intangible Assets
Weighted average amortization periods	8 years
Port terminal operating rights
Acquired Finite Lived Intangible Assets
Weighted average amortization periods	47 years
Customer relationships
Acquired Finite Lived Intangible Assets
Weighted average amortization periods	20 years

Summary of Significant Accounting Policies - Basis Of Presentation, Subsidiaries, Affiliates and Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 6,558	$ 5,386	$ 13,480
Navios Logistics
Percentage of Navios Holdings ownership
Ownership percentage of Navios Holdings	63.80%
Navios Logistics \| Letter of Credit
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash		2,900
Navios Partners and its subsidiaries
Percentage of Navios Holdings ownership
Economic interest	20.80%
General partner interest of Navios Holdings	2.00%
Navios Acquisition and its subsidiaries
Percentage of Navios Holdings ownership
Economic interest	46.20%
Acropolis Chartering and Shipping Inc. ("Acropolis")
Percentage of Navios Holdings ownership
Ownership percentage of Navios Holdings	50.00%
Economic interest	35.00%
Navios Europe I
Percentage of Navios Holdings ownership
Economic interest	47.50%
Navios Europe II
Percentage of Navios Holdings ownership
Economic interest	47.50%
Navios Containers
Percentage of Navios Holdings ownership
Economic interest	3.40%
Retention Accounts
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 5,968	1,896
Amount Held as Security
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 590	$ 590

Summary of Significant Accounting Policies - Long Lived Assets and Deferred Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Annual growth factor management fees after 2018	0.30%
Utilization rate of fleet	99.20%
Amortization of deferred drydock and special survey costs	$ 14,727,000	$ 13,768,000	$ 13,340,000
Amortization and write-off of deferred financing costs	6,391,000	5,653,000	4,524,000
Impairment loss	50,565,000	0	0
Vessels
Property Plant And Equipment [Line Items]
Scrap value of vessels per LWT	340
Capitalized interest costs	$ 4,764,000	$ 5,843,000	$ 5,154,000
Ocean-going vessels \| Minimum
Property Plant And Equipment [Line Items]
Period of review of special costs of assets	30 months
Ocean-going vessels \| Maximum
Property Plant And Equipment [Line Items]
Period of review of special costs of assets	60 months
Pushboats and barges \| Maximum
Property Plant And Equipment [Line Items]
Period of review of special costs of assets	96 months
One vessel held and used
Property Plant And Equipment [Line Items]
Impairment loss	$ 32,930,000

Summary of Significant Accounting Policies - Goodwill and Other Intangibles - Intangibles Other Than Goodwill and Foreign Currency Translation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill	$ 160,336	$ 160,336	$ 160,336
Foreign currency exchange gains/(losses)	(3,000)	$ 1,600	$ 1,646
Shipping Reporting Unit
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill	56,240
Navios Logistics
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill	$ 104,096
Trade name \| Navios Holdings
Acquired Finite Lived Intangible Assets [Line Items]
Useful life of assets	32 years
Finite lived intangible assets amortization method	straight line
Trade name \| Navios Logistics
Acquired Finite Lived Intangible Assets [Line Items]
Useful life of assets	10 years
Finite lived intangible assets amortization method	straight line
Customer relationships \| Navios Holdings
Acquired Finite Lived Intangible Assets [Line Items]
Finite lived intangible assets amortization method	straight line
One of the favorable lease terms
Acquired Finite Lived Intangible Assets [Line Items]
Impairment loss of intangible assets other than goodwill	$ 3,397

Summary of Significant Accounting Policies - Provisions, Employee Benefits, Income Taxes and Dividends (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Provision for loss making voyages in progress			$ 2,631	$ 3,129
Revenue			463,049	419,782	$ 480,820
Termination of indemnities liability			1,336	1,127
Dividends paid to common stockholders			0	0	19,325
Dividends paid to preferred stockholders			0	3,681	16,025
Income tax benefit/(expense)			$ 3,192	(1,265)	3,154
Severance and retirement compensation plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Description of defined contribution pension and other postretirement plans			The amount of compensation is based on the number of years of service and the amount of remuneration at the date of dismissal or retirement up to a maximum of two years' salary. If the employees remain in the employment of the Company until normal retirement age, they are entitled to retirement compensation which is equal to 40% of the compensation amount that would be payable if they were dismissed at that time. The number of employees that will remain with the Company until retirement age is not known.
Defined Benefit Plan, Funded Percentage			40.00%
Argentina
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Effective Income Tax Rate Continuing Operations			35.00%
Argentina \| Tax Reform
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Effective Income Tax Rate Continuing Operations	25.00%	30.00%
Income tax benefit/(expense)			$ 2,837
US Retirement Savings Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Description of defined contribution pension and other postretirement plans			The Company sponsors a 401(k) retirement savings plan, which is categorized as a defined contribution plan. The plan is available to full time employees who meet the plan's eligibility requirements. The plan permits employees to make contributions up to 15% of their annual salary with the Company matching up to the first 6%. The Company makes monthly contributions (matching contributions) to the plan based on amounts contributed by employees. Subsequent to making the matching contributions, the Company has no further obligations. The Company may make an additional discretionary contribution annually if such a contribution is authorized by the Board of Directors. The plan is administered by an independent professional firm that specializes in providing such services.
Pooling arrangements
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Revenue			$ 8,041	$ 15,115	$ 1,825
Minimum \| Stock-Based Compensation
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period			3 years
Maximum \| Stock-Based Compensation
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period			4 years

Summary of Significant Accounting Policies - Convertible Preferred Stock- Cumulative Redeemable Perpetual Preferred Stock (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Par value of preferred stock	$ 0.0001	$ 0.0001
Conversion terms of preferred stock	Five years after the issuance date, 30.0% of the then-outstanding shares of Preferred Stock shall automatically convert into shares of common stock at a conversion price equal to $10.00 per share of common stock with the remaining balance of the then-outstanding shares of Preferred Stock being converted into shares of common stock under the same terms 10 years after their issuance date. At any time following the third anniversary from their issuance date, if the closing price of the common stock has been at least $20.00 per share, for 10 consecutive business days, the remaining balance of the then-outstanding preferred shares shall automatically convert at a conversion price equal to $14.00 per share of common stock. The holders of Preferred Stock are entitled, at their option, at any time following their issuance date and prior to their final conversion date, to convert all or any such then-outstanding preferred shares into common stock at a conversion price equal to $14.00 per common stock.
Dividend rate of preferred stock	2.00%
American Depositary Shares - The Series G
Number of shares \| shares	2,000,000
Preferred Stock, Liquidation Preference Per Share	$ 2,500
Dividend rate of preferred stock	8.75%
Preferred Stock Redemption Terms	Each of the shares represents 1/100th of a share of the Series G, with a liquidation preference of $2,500.00 per share ($25.00 per American Depositary Share). Dividends are payable quarterly in arrears on the Series G at a rate of 8.75% per annum and on the Series H at a rate of 8.625% per annum of the stated liquidation preference. At any time on or after January 28, 2019, the Series G may be redeemed at the Company's option and at any time on or after July 8, 2019, the Series H may be redeemed at the Company's option (and the American Depositary Shares can be caused to be redeemed), in whole or in part, out of amounts legally available therefore, at a redemption price of $2,500.00 per share (equivalent to $25.00 per American Depositary Share) plus an amount equal to all accumulated and unpaid dividends thereon to the date of redemption, whether or not declared. The Company has accounted for these shares as equity.
Sale of Stock- Redemption price per share	$ 25
American Depositary Shares - The Series H
Number of shares \| shares	4,800,000
Preferred Stock, Liquidation Preference Per Share	$ 2,500
Dividend rate of preferred stock	8.625%
Preferred Stock Redemption Terms	Each of the shares represents 1/100th of a share of the Series G, with a liquidation preference of $2,500.00 per share ($25.00 per American Depositary Share). Dividends are payable quarterly in arrears on the Series G at a rate of 8.75% per annum and on the Series H at a rate of 8.625% per annum of the stated liquidation preference. At any time on or after January 28, 2019, the Series G may be redeemed at the Company's option and at any time on or after July 8, 2019, the Series H may be redeemed at the Company's option (and the American Depositary Shares can be caused to be redeemed), in whole or in part, out of amounts legally available therefore, at a redemption price of $2,500.00 per share (equivalent to $25.00 per American Depositary Share) plus an amount equal to all accumulated and unpaid dividends thereon to the date of redemption, whether or not declared. The Company has accounted for these shares as equity.
Sale of Stock- Redemption price per share	$ 25
Five years after the issuance date of Convertible Preferred Stock
Percentage of preferred stock converted	30.00%
Convertible Preferred Stock Share Price	$ 10
After the Third Anniversary of the issuance date
Convertible Preferred Stock Share Price	$ 14
Number of consecutive business days	10
At any time following the issuance date and prior to the final conversion date
Convertible Preferred Stock Share Price	$ 14
At any time on or after January 28, 2019 \| American Depositary Shares - The Series G
Preferred Stock, Liquidation Preference Per Share	2,500
Preferred Stock Redemption Price per American Depositary Share	25
At any time on or after July 8, 2019 \| American Depositary Shares - The Series H
Preferred Stock, Liquidation Preference Per Share	2,500
Preferred Stock Redemption Price per American Depositary Share	25
Minimum \| After the Third Anniversary of the issuance date
Closing price of the common stock	$ 20

Cash and Cash Equivalents (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH AND CASH EQUIVALENTS [Abstract]
Cash on hand and at banks	$ 127,625	$ 126,584
Short-term deposits and highly liquid funds	7	9,408
Cash and cash equivalents	$ 127,632	$ 135,992	$ 163,412	$ 247,556

Accounts Receivable, Net (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ACCOUNTS RECEIVABLE,NET [Abstract]
Accounts receivable	$ 80,037	$ 85,266
Less: provision for doubtful receivables	(19,706)	(19,437)	$ (18,278)	$ (18,464)
Accounts receivable, net	$ 60,331	$ 65,829

Accounts Receivable, Net - Provisions For Doubtful Accounts (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS RECEIVABLE,NET [Abstract]
Balance at Beginning of Period	$ (19,437)	$ (18,278)	$ (18,464)
Charges to Costs and Expenses	(269)	(1,304)	(59)
Amount Utilized	0	145	245
Balance at End of Period	$ (19,706)	$ (19,437)	$ (18,278)

Accounts Receivable, Net (Details)	12 Months Ended
Accounts Receivable, Net (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Concentration of credit risk with respect to accounts receivable	Concentration of credit risk with respect to accounts receivable is limited due to the Company's large number of customers, who are internationally dispersed and have a variety of end markets in which they sell. Due to these factors, management believes that no additional credit risk beyond amounts provided for collection losses is inherent in the Company's trade receivables.
Customer 1
Loss Contingencies [Line Items]
Concentration Risk, Percentage	0.00%	14.70%	15.10%
Customer 2
Loss Contingencies [Line Items]
Concentration Risk, Percentage	0.00%	13.10%

Prepaid Expenses and Other Current Assets (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
PREPAID EXPENSES AND OTHER CURRENT ASSETS [Abstract]
Prepaid voyage and operating costs	$ 8,022	$ 8,352
Claims receivable	12,307	9,822
Prepaid other taxes	4,520	4,279
Advances for working capital purposes	18	4,486
Other	2,516	1,957
Total prepaid expenses and other current assets	$ 27,383	$ 28,896

Vessels, Port Terminal and Other Fixed Assets, Net (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Balance	$ 1,821,101
Revaluation of vessels due to termination of capital lease obligation	5,243	$ 0	$ 210
Write offs	50,565	0	0
Transfers	137,357	0	0
Balance	1,809,225	1,821,101
Cost
Property Plant And Equipment [Line Items]
Balance	2,529,488	2,434,639	2,425,931
Additions	11,122	65,154	8,918
Impairment losses	(104,157)
Disposals	(15,488)
Restructure of capital lease			(210)
Revaluation of vessels due to termination of capital lease obligation	(5,243)
Write offs	(32)
Transfers	137,357	29,695
Balance	2,553,047	2,529,488	2,434,639
Accumulated Depreciation
Property Plant And Equipment [Line Items]
Balance	(708,387)	(610,678)	(514,788)
Additions	(97,114)	(97,709)	(95,890)
Impairment losses	58,034
Disposals	3,613
Write offs	32
Balance	(743,822)	(708,387)	(610,678)
Net Book Value
Property Plant And Equipment [Line Items]
Balance	1,821,101	1,823,961	1,911,143
Additions	(85,992)	(32,555)	(86,972)
Impairment losses	(46,123)
Disposals	(11,875)
Restructure of capital lease			(210)
Revaluation of vessels due to termination of capital lease obligation	(5,243)
Transfers	137,357	29,695
Balance	1,809,225	1,821,101	1,823,961
Vessels \| Cost
Property Plant And Equipment [Line Items]
Balance	1,930,950	1,841,140	1,841,140
Additions		60,115
Impairment losses	(104,157)
Disposals	(11,828)
Transfers		29,695
Balance	1,814,965	1,930,950	1,841,140
Vessels \| Accumulated Depreciation
Property Plant And Equipment [Line Items]
Balance	(521,535)	(447,688)	(376,794)
Additions	(73,017)	(73,847)	(70,894)
Impairment losses	58,034
Balance	(536,518)	(521,535)	(447,688)
Vessels \| Net Book Value
Property Plant And Equipment [Line Items]
Balance	1,409,415	1,393,452	1,464,346
Additions	(73,017)	(13,732)	(70,894)
Impairment losses	(46,123)
Disposals	(11,828)
Transfers		29,695
Balance	1,278,447	1,409,415	1,393,452
Port Terminals (Navios Logistics) \| Cost
Property Plant And Equipment [Line Items]
Balance	109,224	108,686	106,399
Additions	5,060	2,051	2,287
Transfers	137,357	(1,513)
Balance	251,641	109,224	108,686
Port Terminals (Navios Logistics) \| Accumulated Depreciation
Property Plant And Equipment [Line Items]
Balance	(27,391)	(23,898)	(20,467)
Additions	(5,237)	(3,493)	(3,431)
Balance	(32,628)	(27,391)	(23,898)
Port Terminals (Navios Logistics) \| Net Book Value
Property Plant And Equipment [Line Items]
Balance	81,833	84,788	85,932
Additions	(177)	(1,442)	(1,144)
Transfers	137,357	(1,513)
Balance	219,013	81,833	84,788
Tanker vessels, barges and pushboats (Navios Logistics) \| Cost
Property Plant And Equipment [Line Items]
Balance	475,378	470,944	464,966
Additions	5,531	738	6,188
Disposals	(3,585)
Restructure of capital lease			(210)
Revaluation of vessels due to termination of capital lease obligation	(5,243)
Transfers		3,696
Balance	472,081	475,378	470,944
Tanker vessels, barges and pushboats (Navios Logistics) \| Accumulated Depreciation
Property Plant And Equipment [Line Items]
Balance	(150,038)	(131,144)	(111,137)
Additions	(17,603)	(18,894)	(20,007)
Disposals	3,585
Balance	(164,056)	(150,038)	(131,144)
Tanker vessels, barges and pushboats (Navios Logistics) \| Net Book Value
Property Plant And Equipment [Line Items]
Balance	325,340	339,800	353,829
Additions	(12,072)	(18,156)	(13,819)
Restructure of capital lease			(210)
Revaluation of vessels due to termination of capital lease obligation	(5,243)
Transfers		3,696
Balance	308,025	325,340	339,800
Other fixed assets \| Cost
Property Plant And Equipment [Line Items]
Balance	13,936	13,869	13,426
Additions	531	2,250	443
Disposals	(75)
Write offs	(32)
Transfers		(2,183)
Balance	14,360	13,936	13,869
Other fixed assets \| Accumulated Depreciation
Property Plant And Equipment [Line Items]
Balance	(9,423)	(7,948)	(6,390)
Additions	(1,257)	(1,475)	(1,558)
Disposals	28
Write offs	32
Balance	(10,620)	(9,423)	(7,948)
Other fixed assets \| Net Book Value
Property Plant And Equipment [Line Items]
Balance	4,513	5,921	7,036
Additions		775
Additions	(726)		(1,115)
Disposals	(47)
Transfers		(2,183)
Balance	$ 3,740	$ 4,513	$ 5,921

Vessels, Port Terminal and Other Fixed Assets, Net (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 12, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 13, 2017	Jun. 16, 2017	Mar. 31, 2016
Property Plant And Equipment [Line Items]
Cash consideration for purchase of vessel		$ 0	$ 60,115	$ 0
Impairment loss		50,565	0	$ 0
Vessels, Port Terminals and Other Fixed Assets
Property Plant And Equipment [Line Items]
Capitalized interest costs		3,384	$ 1,934
One vessel held and used
Property Plant And Equipment [Line Items]
Impairment loss		$ 32,930
Navios Ionian
Property Plant And Equipment [Line Items]
Disposal date		Jun. 16, 2017
Year Built		2000
Vessel capacity in DWT		52,067 dwt
Vessel impairment loss		$ 9,098
Vessel sale price						$ 5,280
Capitalized Cost, Impairment Loss		$ 551
Navios Horizon
Property Plant And Equipment [Line Items]
Disposal date		Jul. 13, 2017
Year Built		2001
Vessel capacity in DWT		50,346 dwt
Vessel impairment loss		$ 5,141
Vessel sale price					$ 6,548
Capitalized Cost, Impairment Loss		$ 495
Navios Sphera
Property Plant And Equipment [Line Items]
Date of delivery		Jan. 12, 2016
Year Built		2016
Vessel capacity in DWT		84,872 dwt
Vessel acquisition cost	$ 34,352
Navios Mars
Property Plant And Equipment [Line Items]
Date of delivery		Jan. 12, 2016
Year Built		2016
Date of delivery		Jan. 12, 2016
Vessel capacity in DWT		181,259 dwt
Vessel acquisition cost	55,458
Navios Sphera and Navios Mars
Property Plant And Equipment [Line Items]
Cash consideration for purchase of vessel	49,910
Amount of loan used to finance purchase of vessel	$ 39,900
Amount transferred to vessels' cost							$ 29,695

Vessels, Port Terminal and Other Fixed Assets, Net - Navios Logistics (Details) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)	May 18, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jun. 03, 2016 USD ($)
Property Plant And Equipment [Line Items]
Purchase price obligation	$ 0		$ 17,617
Payments for construction in process	36,589		86,911	$ 26,713
Repayments of obligations under capital leases	12,374		3,032	1,501
Vessels, port terminals and other fixed assets, net	1,809,225		1,821,101
Prepaid expenses and other current assets	27,383		28,896
Other long term assets	4,856		2,647
Gain on sale of assets	$ 1,064		0	$ 0
Ferni H
Property Plant And Equipment [Line Items]
Vessel Capacity	16,871 dwt	16,871 dwt
San San H
Property Plant And Equipment [Line Items]
Vessel Capacity	16,871 dwt	16,871 dwt
Ferni H and San San H
Property Plant And Equipment [Line Items]
Repayments of obligations under capital leases			3,032
Vessel acquisition cost						$ 11,239
Three new pushboats, price per each
Property Plant And Equipment [Line Items]
Total purchase price								$ 7,344
Payments for construction in process	$ 30,708		16,156
Date of expected delivery	February 2018	February 2018
Expansion of its dry port
Property Plant And Equipment [Line Items]
Payments for construction in process			120,735
Capitalized interest costs	$ 9,971		$ 6,862
Vessels, port terminals and other fixed assets, net	137,357
River and estuary tanker
Property Plant And Equipment [Line Items]
Total purchase price	14,854				€ 12,400
Payments for construction in process	$ 6,141
Date of expected delivery	Q2 2018	Q2 2018
Capitalized interest costs	$ 205
River and estuary tanker \| Maximum
Property Plant And Equipment [Line Items]
Amount financed by third party	$ 7,427	€ 6,200
River and estuary tanker \| Shipbuilder
Property Plant And Equipment [Line Items]
Percentage financed by third party	50.00%	50.00%
Formosa and San Lorenzo
Property Plant And Equipment [Line Items]
Vessel sale price							$ 1,109
Prepaid expenses and other current assets	$ 318
Other long term assets	500
Gain on sale of assets	1,075
Covers for Dry Barges
Property Plant And Equipment [Line Items]
Total purchase price	1,115
Payments for construction in process	$ 629

Intangible Assets/Liabilities Other Than Goodwill (Table) (Details) - USD ($)
$ in Thousands

Dec. 31, 2017

Dec. 31, 2016

Trade name

Acquired Finite Lived Intangible Assets [Line Items]

$ 100,420

(45,156)

(41,303)

Port terminal operating rights

55,264

59,117

Acquired Finite Lived Intangible Assets [Line Items]

53,152

(10,889)

(10,162)

Acquired Finite Lived Intangible Assets [Line Items]

42,263

42,990

Customer relationships

35,490

(17,745)

(15,971)

Acquired Finite Lived Intangible Assets [Line Items]

17,745

19,519

Favorable lease terms

^[1]

11,548

82,485

^[1]

(6,359)

^[1]

(10,398)

(70,937)

Acquired Finite Lived Intangible Assets [Line Items]

^[1]

1,150

5,189

Total Intangible assets

200,610

271,547

(73,790)

(73,795)

(10,398)

(70,937)

Acquired Finite Lived Intangible Assets [Line Items]

$ 116,422

126,815

Unfavorable lease terms

(24,721)

^[2]

^[2]

24,721

Acquired Finite Lived Intangible Assets [Line Items]

^[2]

Total

246,826

(73,795)

(46,216)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

$ 126,815

[1]

[2]

Intangible Assets/Liabilities Other Than Goodwill - Amortization Expense (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trade name
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	$ 3,853	$ 3,902	$ 3,811
Port terminal operating rights
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	727	706	1,006
Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	1,775	1,775	1,775
Favorable lease terms
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	4,038	17,260	32,444
Unfavorable lease terms
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	0	(7,526)	(14,615)
Total
Acquired Finite Lived Intangible Assets [Line Items]
Amortization Expense and Write Offs	$ 10,393	$ 16,117	$ 24,420

Intangible Assets/Liabilities Other Than Goodwill - Amortization Schedule (Table) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Within one year	$ 5,571
Year Two	5,571
Year Three	5,578
Year Four	5,571
Year Five	5,571
Thereafter	87,410
Total amortization	115,272
Trade name
Acquired Finite Lived Intangible Assets [Line Items]
Within one year	2,811
Year Two	2,811
Year Three	2,818
Year Four	2,811
Year Five	2,811
Thereafter	41,202
Total amortization	55,264
Port terminal operating rights
Acquired Finite Lived Intangible Assets [Line Items]
Within one year	985
Year Two	985
Year Three	985
Year Four	985
Year Five	985
Thereafter	37,338
Total amortization	42,263
Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Within one year	1,775
Year Two	1,775
Year Three	1,775
Year Four	1,775
Year Five	1,775
Thereafter	8,870
Total amortization	$ 17,745

Intangible Assets/Liabilities Other Than Goodwill - Additional Details (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 15, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible asset		$ 116,422	$ 126,815
Favorable lease terms
Intangible asset		1,150	1,180
Acquisition cost		10,398	70,937
Accumulated amortization		7,001	57,930
Gain / (loss) resulting from favorable lease terms written off		$ (3,397)	(13,007)
Unfavorable lease terms
Unfavorable lease terms			0
Acquisition cost			24,721
Accumulated amortization			17,406
Gain / (loss) resulting from favorable lease terms written off			$ 7,315
Two Companies \| Navios Logistics
Date of acquisition		Dec. 15, 2014
Total consideration	$ 17,000
Deferred Payment For Acquisition Intangible Assets				$ 6,800	$ 10,200

Investments in affiliates and investments in available-for-sale securities (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Navios Partners
Balance sheet
Cash and cash equivalents, including restricted cash	$ 29,933	$ 25,088
Current assets	60,306	56,349
Non-current assets	1,244,996	1,212,231
Current liabilities	54,247	98,950
Long- term debt including current portion, net	493,463	523,776
Non-current liabilities	483,345	489,421
Income Statement
Revenue	211,652	190,524	$ 223,676
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II	(15,090)	(52,549)	41,805
Net (loss)/income	(15,090)	(52,549)	41,805
Navios Europe I
Balance sheet
Cash and cash equivalents, including restricted cash	19,185	10,785
Current assets	22,417	15,980
Non-current assets	145,940	169,925
Current liabilities	21,284	18,490
Long- term debt including current portion, net	75,472	86,060
Non-current liabilities	125,283	155,387
Income Statement
Revenue	37,468	40,589	41,437
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II	(20,778)	(2,174)	(1,347)
Net (loss)/income	9,762	16,137	(1,118)
Navios Europe II
Balance sheet
Cash and cash equivalents, including restricted cash	16,882	16,916
Current assets	28,403	19,487
Non-current assets	195,784	232,363
Current liabilities	25,805	24,126
Long- term debt including current portion, net	109,223	119,234
Non-current liabilities	164,276	184,530
Income Statement
Revenue	38,633	30,893	20,767
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II	22,749	(25,062)	1,673
Net (loss)/income	(9,086)	$ (34,059)	$ 77,252
Navios Containers
Balance sheet
Cash and cash equivalents, including restricted cash	14,501
Current assets	21,371
Non-current assets	245,440
Current liabilities	49,559
Long- term debt including current portion, net	119,033
Non-current liabilities	76,534
Income Statement
Revenue	39,188
Net (loss)/ income before non-cash change in fair value of Junior Loan I and Junior Loan II	2,638
Net (loss)/income	$ 2,638

Investments in affiliates and investments in available-for-sale securities (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended
	Feb. 28, 2015	Mar. 31, 2017	Mar. 20, 2017	Mar. 17, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Payments to acquire common stock						$ 7,638	$ 0	$ 22,846
Equity in net earnings of affiliated companies						4,399	(202,779)	61,484
Investments in affiliates						183,160	160,071	381,746
Dividends received						7,298	0	18,244
Other than temporary impairment loss on investments							228,026
Navios Partners
Schedule Of Equity Method Investments [Line Items]
General partner interest of Navios Holdings		2.00%	2.00%		2.00%
Common Units issued in public offering		1,200,442
Payments to acquire investment		$ 110	$ 2,048		$ 12
Number of shares issued-common stock			47,795,000
Equity in net earnings of affiliated companies						$ 1,892	1,833	2,621
Private placement of units to Navios Holdings		2,040,000
Partners capital account units acquisitions		66,131	975,408		7,376
Price per common unit			$ 2.1
Navios Revolving Loans I Transfer
Schedule Of Equity Method Investments [Line Items]
Long-term liability recognized				$ 33,473
Proceeds from transfer of debt				$ 4,050
Navios Revolving Loans I Transfer \| Navios Partners
Schedule Of Equity Method Investments [Line Items]
General partner interest of Navios Holdings				2.00%
Payments to acquire investment				$ 468
Number of shares issued-common stock				13,076,923
Consideration equity component				$ 29,423
Partners capital account units acquisitions				266,876
Navios Partners
Schedule Of Equity Method Investments [Line Items]
Common Units issued in public offering	4,600,000
Proceeds From Issuance Of Common Limited Partners Units	$ 60,214
Proceeds from private placement of units to Navios Holdings	$ 14,967
Navios Partners \| Private placement \| Common units
Schedule Of Equity Method Investments [Line Items]
Private placement of units to Navios Holdings	1,120,547
Navios Partners \| Private placement \| General partner units
Schedule Of Equity Method Investments [Line Items]
Private placement of units to Navios Holdings	22,868
Navios Partners
Schedule Of Equity Method Investments [Line Items]
General partner interest of Navios Holdings						2.00%
Payments to acquire common stock	$ 1,229
General Partner units held by Navios Holdings						3,016,284
Common units held by Navios Holdings						28,421,233
Difference between carrying amount of investment and underlying equity in net assets of equity method investee						$ 98,608	112,417
Equity in net earnings of affiliated companies						12,570	(5,979)	15,462
Investments in affiliates						66,773	24,033
Dividends received						$ 0	0	27,993
Ownership percentage of Navios Holdings						20.80%
Market value of the investment						$ 74,193
Other than temporary impairment loss on investments							83,596
Acropolis
Schedule Of Equity Method Investments [Line Items]
Investments in affiliates						228	105
Dividends received						$ 55	85	454
Ownership percentage of Navios Holdings						35.00%
Ownership Interest						50.00%
Profit Sharing Arrangement						Navios Holdings has a 50% interest in Acropolis, a brokerage firm for freight and shipping charters. Although Navios Holdings owns 50% of Acropolis' stock, Navios Holdings agreed with the other shareholder that the earnings and amounts declared by way of dividends will be allocated 35% to the Company with the balance to the other shareholder.
Navios Acquisition
Schedule Of Equity Method Investments [Line Items]
Difference between carrying amount of investment and underlying equity in net assets of equity method investee						$ 113,597	140,131
Equity in net earnings of affiliated companies						(9,875)	29,801	43,299
Investments in affiliates						99,590	124,062
Dividends received						$ 14,595	14,595	$ 18,244
Ownership percentage of Navios Holdings						46.20%
Percentage of voting stock of Navios Holdings in Navios Acquisition						42.90%
Market value of the investment						$ 81,005
Other than temporary impairment loss on investments							$ 144,430

Investments in affiliates and investments in available-for-sale securities - Navios Europe I and Navios Europe II (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 18, 2013 USD ($)	Feb. 18, 2015 USD ($)
Investments In And Advances To Affiliates [Line Items]
Long-term debt		$ 1,682,488	$ 1,651,095	$ 1,581,308
Investments in affiliates		183,160	160,071	381,746
Portion of the carrying balance of related party loan		30,112	23,008
Equity in net earnings of affiliated companies		4,399	(202,779)	61,484
Navios Europe I
Investments In And Advances To Affiliates [Line Items]
Difference between carrying amount of investment and underlying equity in net assets of equity method investee		4,034	4,710		$ 6,763
Estimated maximum potential loss		23,838	18,268
Investments in affiliates		$ 4,750	5,967		$ 4,750
Profit Sharing Arrangement		On an ongoing basis, Navios Europe I is required to distribute cash flows (after payment of operating expenses and amounts due pursuant to the terms of the Senior Loans I) according to a defined waterfall calculation.
Equity in net earnings of affiliated companies		$ (1,089)	1,303	$ 1,293
Number of vessels acquired					10
Navios Europe I \| Navios Term Loans I
Investments In And Advances To Affiliates [Line Items]
Investents in affiliates including accrued interest		7,924	8,198
Navios Europe I \| Navios Revolving Loans I
Investments In And Advances To Affiliates [Line Items]
Portion of the carrying balance of related party loan		15,914	10,070
Navios Europe I \| Navios Revolving Loans I \| Navios Holdings, Navios Acquisition and Navios Partners
Investments In And Advances To Affiliates [Line Items]
Line of credit facility maximum borrowing capacity					$ 24,100
Navios Europe I \| 10 vessels \| Navios Holdings, Navios Acquisition and Navios Partners
Investments In And Advances To Affiliates [Line Items]
Long-term debt					$ 10,000
Navios Europe II
Investments In And Advances To Affiliates [Line Items]
Difference between carrying amount of investment and underlying equity in net assets of equity method investee		7,011	7,953			$ 9,419
Estimated maximum potential loss		22,463	22,287
Investments in affiliates		$ 6,650	5,894			$ 6,650
Profit Sharing Arrangement		On an ongoing basis, Navios Europe II is required to distribute cash flows (after payment of operating expenses, amounts due pursuant to the terms of the Senior Loans II) according to a defined waterfall calculation.
Equity in net earnings of affiliated companies		$ 2,456	(14)
Number of vessels acquired				14
Navios Europe II \| Navios Term Loans II
Investments In And Advances To Affiliates [Line Items]
Investents in affiliates including accrued interest		10,400	7,944
Navios Europe II \| Navios Revolving Loans II
Investments In And Advances To Affiliates [Line Items]
Portion of the carrying balance of related party loan		$ 12,063	$ 14,343
Navios Europe II \| Navios Revolving Loans II \| Navios Holdings, Navios Acquisition and Navios Partners
Investments In And Advances To Affiliates [Line Items]
Line of credit facility maximum borrowing capacity				$ 43,500
Line of Credit Facility, Increase	$ 14,000
Navios Europe II \| 14 Vessels \| Navios Holdings, Navios Acquisition and Navios Partners
Investments In And Advances To Affiliates [Line Items]
Long-term debt				$ 14,000

Investments in affiliates and investments in available-for-sale securities - Navios Containers (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended	5 Months Ended	12 Months Ended
	Feb. 28, 2015	Mar. 31, 2017	Jun. 08, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments In And Advances To Affiliates [Line Items]
Equity/(loss) in net earnings of affiliated companies				$ 4,399	$ (202,779)	$ 61,484
Investments in affiliates				183,160	160,071	381,746
Navios Partners
Investments In And Advances To Affiliates [Line Items]
Proceeds from Issuance of Private Placement	$ 14,967
Navios Partners \| Private placement \| Common units
Investments In And Advances To Affiliates [Line Items]
Partners' Capital Account, Units, Sold in Private Placement	1,120,547
Navios Partners
Investments In And Advances To Affiliates [Line Items]
Partners' Capital Account, Units, Sold in Private Placement		2,040,000
Equity/(loss) in net earnings of affiliated companies				$ 1,892	$ 1,833	$ 2,621
Navios Containers
Investments In And Advances To Affiliates [Line Items]
Investments on the equity			$ 5,000
Ownership percentage of Navios Holdings				3.40%
Equity/(loss) in net earnings of affiliated companies				$ 161
Investments in affiliates				5,161
Market value of the investment				$ 5,581
Navios Containers \| Common units
Investments In And Advances To Affiliates [Line Items]
Partners' Capital Account, Units, Sold in Private Placement			10,057,645
Price per share offered			$ 5
Proceeds from Issuance of Private Placement			$ 50,288
Navios Containers \| Warrants
Investments In And Advances To Affiliates [Line Items]
Ownership interest			1.70%
Exercise price			$ 5
Warrants, Expected term			5 years
Navios Containers \| Navios Partners
Investments In And Advances To Affiliates [Line Items]
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent			$ 30,000
Navios Containers \| Navios Partners \| Warrants
Investments In And Advances To Affiliates [Line Items]
Ownership percentage			6.80%

Investments in affiliates and investments in available-for-sale securities - Investments in available-for-sale securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]
Reclassification to earnings	$ 0	$ 345	$ 1,782
Investment in available-for-sale-securities	238	0
Unrealized gain	$ 2	0
KLC and STX
Schedule Of Equity Method Investments [Line Items]
Consideration received for AFS securities sold		5,303
Korea Line Corporation (''KLC'')
Schedule Of Equity Method Investments [Line Items]
Reclassification to earnings		$ 345	$ 1,783

Accrued Expenses and Other Liabilitites (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ACCRUED EXPENSES AND OTHER LIABILITIES [Abstract]
Payroll	$ 18,889	$ 14,730
Accrued interest	32,555	36,273
Accrued voyage expenses	4,843	2,217
Accrued running costs	23,812	21,394
Provision for estimated losses on vessels under time charter	2,631	3,129
Audit fees and related services	364	266
Accrued taxes	5,376	5,092
Professional fees	2,236	1,707
Other accrued expenses	4,153	6,941
Total accrued expenses	$ 94,859	$ 91,749

Borrowings (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long Term Loans From Bank	$ 346,604	$ 274,855
Total borrowings	1,717,768	1,675,415
Less: current portion, net	(33,885)	(29,827)
Less: deferred finance costs and discount, net	(35,280)	(24,320)
Total long-term borrowings	1,648,603	1,621,268
Navios Holdings borrowings
Debt Instrument [Line Items]
Total borrowings	1,174,856	1,240,647
Navios Logistics borrowings
Debt Instrument [Line Items]
Other long-term loans	253	321
2019 Notes
Debt Instrument [Line Items]
Senior Notes	0	291,094
2022 Senior Secured Notes
Debt Instrument [Line Items]
Senior Notes	305,000	0
2022 Notes
Debt Instrument [Line Items]
Senior Notes	650,000	650,000
2022 Logistics Senior Notes
Debt Instrument [Line Items]
Senior Notes	375,000	375,000
Navios Logistics Notes Payable
Debt Instrument [Line Items]
Senior Notes	31,109	34,447
Navios Logistics BBVA Loan Facility
Debt Instrument [Line Items]
Long Term Loans From Bank	23,250	25,000
Navios Logistics Alpha Bank Loan
Debt Instrument [Line Items]
Long Term Loans From Bank	13,300	0
Navios Logistics Term Loan B Facility
Debt Instrument [Line Items]
Long Term Loans From Bank	100,000	0
Total Navios Logistics borrowings \| Navios Logistics borrowings
Debt Instrument [Line Items]
Total borrowings	542,912	434,768
Commerzbank A.G. ($240,000)
Debt Instrument [Line Items]
Line of credit	0	19,857
HSH Nordbank ($15,300)
Debt Instrument [Line Items]
Line of credit	14,535	0
Loan Facility Credit Agricole ($40,000)
Debt Instrument [Line Items]
Line of credit	17,674	18,880
Loan Facility Credit Agricole ($23,000)
Debt Instrument [Line Items]
Line of credit	14,074	14,755
Loan Facility Credit Agricole ($23,000)
Debt Instrument [Line Items]
Line of credit	14,450	15,150
Loan Facility DVB Bank SE ($72,000)
Debt Instrument [Line Items]
Line of credit	50,140	54,540
Loan Facility DVB Bank SE ($41,000)
Debt Instrument [Line Items]
Line of credit	33,816	37,293
Loan Facility Credit Agricole ($22,500)
Debt Instrument [Line Items]
Line of credit	15,188	16,313
Loan Facility DVB Bank SE ($40,000)
Debt Instrument [Line Items]
Line of credit	18,254	28,000
Loan Facility Alpha Bank ($31,000)
Debt Instrument [Line Items]
Line of credit	25,600	27,400
Loan Facility Alpha Bank ($16,125)
Debt Instrument [Line Items]
Line of credit	16,125	16,125
Navios Acquisition Loan
Debt Instrument [Line Items]
Line of credit	$ 0	$ 51,240

Borrowings - Principal Payments (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
BORROWINGS [Abstract]
2018	$ 35,988
2019	33,326
2020	71,454
2021	154,825
2022	1,414,638
2023 and thereafter	7,537
Total	$ 1,717,768	$ 1,675,415

Borrowings - Senior and Ship Mortgage Notes Navios Holdings and Navios Logistics (Details) - USD ($) $ in Thousands	10 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Amount used for repayment of debt		$ 48,600
Gain/ (Loss) on bond and debt extinguishment		(981)	$ 29,187	$ 0
Dividends paid		0	3,681	$ 35,350
Dividends paid to the non controlling shareholders		25,323
2022 Senior Secured Notes
Debt Instrument [Line Items]
Face amount at issuance date		$ 305,000
Issuance date/Date of agreement		Nov. 21, 2017
Debt instrument, issuance price percentage		97.00%
Fixed interest rate		11.25%
Gain/ (Loss) on bond and debt extinguishment		$ (2,695)
2022 Senior Secured Notes \| On or after November 21, 2017
Debt Instrument [Line Items]
Redemption price percentage		108.438%
Senior Notes due 2019
Debt Instrument [Line Items]
Face amount at issuance date		$ 350,000
Issuance date/Date of agreement		Jan. 28, 2011
Amount oustanding		$ 0	291,094
Fixed interest rate		8.125%
Repurchase of notes	$ 58,906
Repurchase of senior notes - cash consideration	30,671
Gain/ (Loss) on bond and debt extinguishment	$ 27,670
2022 Notes
Debt Instrument [Line Items]
Face amount at issuance date		$ 650,000
Issuance date/Date of agreement		Nov. 29, 2013
Amount oustanding		$ 650,000	650,000
Fixed interest rate		7.375%
2022 Notes \| On or after January 15, 2017
Debt Instrument [Line Items]
Redemption price percentage		105.531%
2022 Notes \| Upon occurrence of certain change of control events
Debt Instrument [Line Items]
Redemption price percentage		101.00%
2022 Logistics Senior Notes
Debt Instrument [Line Items]
Amount oustanding		$ 375,000	$ 375,000
2022 Logistics Senior Notes \| Navios Logistics
Debt Instrument [Line Items]
Face amount at issuance date		$ 375,000
Issuance date/Date of agreement		Apr. 22, 2014
Fixed interest rate		7.25%
Maturity date		May 01, 2022
Maximum dividend percentage		6.00%
2022 Logistics Senior Notes \| Navios Logistics \| On or after May 1, 2017
Debt Instrument [Line Items]
Redemption price percentage		105.438%
2022 Logistics Senior Notes \| Navios Logistics \| Upon occurrence of certain change of control events
Debt Instrument [Line Items]
Redemption price percentage		101.00%
2022 Logistics Senior Notes \| All subsidiaries of Navios Logistics
Debt Instrument [Line Items]
Percentage of ownership		100.00%
Navios Logistics Alpha Bank Loan
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity		$ 14,000
Interest Rate		LIBOR (90 days) plus 315 basis points
Fixed interest rate		3.15%
Duration of loan		5 years
Repayment installments		20
Repayment frequency		quarterly
Balloon payment on the last repayment date		$ 7,000
Navios Logistics Term Loan B Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity		$ 100,000
Interest Rate		LIBOR plus 475 basis points
Fixed interest rate		4.75%
Duration of loan		4 years
Debt amortization percentage		1.00%
Dividends paid		$ 70,000
Dividends paid to Navios Holdings		44,677
Dividends paid to the non controlling shareholders		$ 25,323
Line of credit facility issuance date		Nov. 03, 2017
Debt Instrument Collateral		5 tanker vessels

Borrowings - Loan Facilities Navios Holdings (Details) $ in Thousands	5 Months Ended	10 Months Ended			12 Months Ended
	May 31, 2017 USD ($)	Nov. 03, 2017 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2010 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2010 USD ($)
Debt Instrument [Line Items]
Gain/ (Loss) on bond and debt extinguishment					$ (981)	$ 29,187	$ 0
Repayment of debt					48,600
Payments related to installments for the current year					25,707
Payments related to installments for the next year					7,286
(Repayment of)/proceeds from loan payable to affiliate company					$ (55,132)	50,000	$ 0
Other long-term loans \| Navios Logistics
Debt Instrument [Line Items]
Line of credit facility issuance date					Oct. 29, 2009
Maximum borrowing capacity					$ 817
Repayment frequency					monthly
Repayment installment					$ 6
Amount outstanding					$ 253	321
Fixed interest rate					6.00%
Repayment terms					The loan facility bears interest at a fixed rate of 600 basis points. The loan is repayable in monthly installments of $6 each and the final repayment must occur prior to August 10, 2021.
Navios Logistics Notes Payable
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 41,964
Repayment installments					16
Repayment frequency					semi-annual
Interest Rate					six-month LIBOR
Debt finance costs					$ 5,949
Navios Logistics BBVA Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 25,000
Loan margin percentage					3.25%
Repayment installments					20
Repayment frequency					quarterly
Interest Rate					LIBOR (180 days) plus 325 basis points
One of the secured credit facilities
Debt Instrument [Line Items]
Amount outstanding					$ 17,332
Gain/ (Loss) on bond and debt extinguishment					1,715
Repayment of debt					$ 15,607
Loan Facility Credit Agricole Bank ($40,000) to finance the construction of one newbuilding Capesize vessel
Debt Instrument [Line Items]
Line of credit facility issuance date					Sep. 30, 2010
Maximum borrowing capacity					$ 40,000
Loan margin percentage					2.75%
Interest rate description					LIBOR plus 275 basis points
Balloon payment on the last repayment date					$ 6,810
Amount outstanding					$ 17,674	18,880
Maturity date					Aug. 31, 2021
Loan Facility Credit Agricole Bank ($40,000) to finance the construction of one newbuilding Capesize vessel \| First installment
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 2,411
Loan Facility Credit Agricole Bank ($40,000) to finance the construction of one newbuilding Capesize vessel \| From 2nd to 9th installment
Debt Instrument [Line Items]
Repayment installments					7
Repayment frequency					semi-annual
Repayment installment					$ 1,205
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one Panamax vessel
Debt Instrument [Line Items]
Line of credit facility issuance date					Aug. 31, 2011
Maximum borrowing capacity					$ 23,000
Loan margin percentage					2.75%
Interest rate description					LIBOR plus 275 basis points
Balloon payment on the last repayment date					$ 7,264
Amount outstanding					$ 14,074	14,755
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one Panamax vessel \| First installment
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 681
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one Panamax vessel \| From 2nd to 10th installment
Debt Instrument [Line Items]
Repayment installments					9
Repayment frequency					semi-annual
Repayment installment					$ 681
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one newbuilding bulk carrier
Debt Instrument [Line Items]
Line of credit facility issuance date					Dec. 31, 2011
Maximum borrowing capacity					$ 23,000
Loan margin percentage					3.25%
Interest rate description					LIBOR plus 325 basis points
Balloon payment on the last repayment date					$ 7,450
Amount outstanding					$ 14,450	15,150
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one newbuilding bulk carrier \| First installment
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 700
Loan Facility Credit Agricole ($23,000) to partially finance the construction of one newbuilding bulk carrier \| From 2nd to 10th installment
Debt Instrument [Line Items]
Repayment installments					9
Repayment frequency					semi-annual
Repayment installment					$ 700
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels
Debt Instrument [Line Items]
Line of credit facility issuance date					Dec. 20, 2013
Maximum borrowing capacity					$ 22,500
Loan margin percentage					3.00%
Interest rate description					LIBOR plus 300 basis points
Amount outstanding					$ 15,188	16,313
Number Of Loan Tranches					2
Maturity date					Aug. 31, 2021
Debt instrument collateral					1 bulk carrier
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| Tranche A
Debt Instrument [Line Items]
Balloon payment on the last repayment date					$ 2,812
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| Tranche B
Debt Instrument [Line Items]
Balloon payment on the last repayment date					$ 2,812
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| First installment \| Tranche A
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 563
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| First installment \| Tranche B
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 1,125
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| From 2nd to 8th installment \| Tranche A
Debt Instrument [Line Items]
Repayment installments					7
Repayment frequency					semi-annual
Repayment installment					$ 563
Loan Facility Credit Agricole ($22,500) to finance the acquisition of two Panamax Vessels \| From 2nd to 8th installment \| Tranche B
Debt Instrument [Line Items]
Repayment installments					7
Repayment frequency					semi-annual
Repayment installment					$ 563
Commerzbank A.G. to finance acquisition of one Capesize vessel and construction of three Capesize vessels
Debt Instrument [Line Items]
Line of credit facility issuance date					Jun. 30, 2009
Maximum borrowing capacity					$ 240,000
Amount outstanding					$ 0	19,857
Number Of Loan Tranches					4
Amount of each tranche					$ 60,000
Number of the cancellated tranches								2
Commerzbank A.G. to finance acquisition of one Capesize vessel and construction of three Capesize vessels \| Tranche A
Debt Instrument [Line Items]
Repayment of debt				$ 53,600
Commerzbank A.G. to finance acquisition of one Capesize vessel and construction of three Capesize vessels \| Tranche B
Debt Instrument [Line Items]
Repayment of debt				$ 54,500
Commerzbank A.G. to finance acquisition of one Capesize vessel and construction of three Capesize vessels \| Tranche C
Debt Instrument [Line Items]
Amount outstanding			$ 15,319
Gain/ (Loss) on bond and debt extinguishment						1,517
Repayment of debt			$ 13,802
Commerzbank A.G. to finance acquisition of one Capesize vessel and construction of three Capesize vessels \| Tranche D
Debt Instrument [Line Items]
Amount outstanding	$ 17,322
Gain/ (Loss) on bond and debt extinguishment					$ 1,715
Repayment of debt	$ 15,607
HSH Nordbank A.G. ($15,300) to partially refinance the 4th tranche of the Commerzbank facility
Debt Instrument [Line Items]
Line of credit facility issuance date					May 23, 2017
Maximum borrowing capacity					$ 15,300
Loan margin percentage					3.00%
Interest rate description					LIBOR plus 300 basis points
Repayment installments					15
Repayment frequency					quarterly
Repayment installment					$ 383
Balloon payment on the last repayment date					$ 8,798
Loan Facility DVB Bank SE ($72,000)
Debt Instrument [Line Items]
Line of credit facility issuance date					Mar. 23, 2012
Maximum borrowing capacity					$ 42,000
Amount outstanding					$ 50,140	54,540
Number Of Loan Tranches					2
Loan Facility DVB Bank SE ($72,000) \| Tranche A
Debt Instrument [Line Items]
Loan margin percentage					2.85%
Interest rate description					LIBOR plus 285 basis points
Repayment installments					9
Repayment frequency					quarterly
Repayment installment					$ 362
Balloon payment on the last repayment date					14,400
Amount of each tranche					$ 26,000
Loan Facility DVB Bank SE ($72,000) \| Tranche B
Debt Instrument [Line Items]
Loan margin percentage					3.60%
Interest rate description					LIBOR plus 360 basis points
Repayment installments					10
Repayment frequency					quarterly
Repayment installment					$ 269
Balloon payment on the last repayment date					6,354
Amount of each tranche					$ 16,000
Loan Facility DVB Bank SE ($72,000) \| New Tranche June 2014
Debt Instrument [Line Items]
Line of credit facility issuance date					Jun. 27, 2014
Loan margin percentage					2.75%
Interest rate description					LIBOR plus 275 basis points
Repayment installments					10
Repayment frequency					quarterly
Repayment installment					$ 469
Balloon payment on the last repayment date					18,750
Amount of each tranche					$ 30,000
Loan Facility DVB Bank SE ($40,000) to finance the acquisition of four Panamax vessels
Debt Instrument [Line Items]
Line of credit facility issuance date					Sep. 30, 2013
Maximum borrowing capacity					$ 40,000
Loan margin percentage					3.25%
Interest rate description					LIBOR plus 325 basis points
Repayment installments					15
Repayment frequency					quarterly
Repayment installment					$ 730
Balloon payment on the last repayment date					7,302
Amount outstanding					$ 18,254	28,000
Maturity date					Sep. 30, 2021
Debt instrument collateral					1 newbuilding Panamax and 1 newbuilding Capesize vessel
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel
Debt Instrument [Line Items]
Line of credit facility issuance date					Jan. 31, 2016
Maximum borrowing capacity					$ 41,000
Loan margin percentage					2.55%
Interest rate description					LIBOR plus 255 basis points
Amount outstanding					$ 33,816	37,293
Number Of Loan Tranches					2
Amount drawn down						39,900
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| Tranche A
Debt Instrument [Line Items]
Balloon payment on the last repayment date					$ 14,760
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| Tranche B
Debt Instrument [Line Items]
Balloon payment on the last repayment date					$ 8,764
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| First installment \| Tranche A
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 492
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| First installment \| Tranche B
Debt Instrument [Line Items]
Repayment installments					1
Repayment frequency					quarterly
Repayment installment					$ 377
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| From 2nd to 17th installment \| Tranche A
Debt Instrument [Line Items]
Repayment installments					16
Repayment frequency					quarterly
Repayment installment					$ 369
Loan Facility DVB Bank SE ($41,000) to finance the acquisition of one newbuilding Panamax vessel and one newbuilding Capesize vessel \| From 2nd to 17th installment \| Tranche B
Debt Instrument [Line Items]
Repayment installments					16
Repayment frequency					quarterly
Repayment installment					$ 220
Alpha Bank A.E. ($31,000) to finance part of the acquisition of a Capesize vessel
Debt Instrument [Line Items]
Line of credit facility issuance date					Nov. 06, 2014
Maximum borrowing capacity					$ 31,000
Loan margin percentage					3.00%
Interest rate description					LIBOR plus 300 basis points
Repayment installments					20
Repayment frequency					quarterly
Repayment installment					$ 450
Balloon payment on the last repayment date					16,600
Amount outstanding					$ 25,600	27,400
Alpha Bank A.E. ($16,125) to refinance one Capesize vessel
Debt Instrument [Line Items]
Line of credit facility issuance date					Nov. 03, 2016
Maximum borrowing capacity					$ 16,125
Loan margin percentage					3.00%
Interest rate description					LIBOR plus 300 basis points
Balloon payment on the last repayment date					$ 10,725
Amount outstanding					$ 16,125	16,125
Alpha Bank A.E. ($16,125) to refinance one Capesize vessel \| First 4 installments
Debt Instrument [Line Items]
Repayment installments					4
Repayment frequency					quarterly
Repayment installment					$ 250
Alpha Bank A.E. ($16,125) to refinance one Capesize vessel \| From 5th to 21rst installments
Debt Instrument [Line Items]
Repayment installments					16
Repayment frequency					quarterly
Repayment installment					$ 275
Navios Acquisition Loan
Debt Instrument [Line Items]
Line of credit facility issuance date					Sep. 19, 2016
Maximum borrowing capacity					$ 70,000
Amount outstanding					$ 0	51,240
(Repayment of)/proceeds from loan payable to affiliate company		$ (55,132)				$ 50,000
Accrued interest		$ 5,132

Borrowings - Additional Information (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
BORROWINGS [Abstract]
Annual weighted average interest rate	7.11%	6.87%	6.98%

Borrowings - Repayment Terms and Covenants (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	The credit facilities contain a number of restrictive covenants that limit Navios Holdings and/or certain of its subsidiaries from, among other things: incurring or guaranteeing indebtedness; entering into affiliate transactions; charging, pledging or encumbering the vessels securing such facilities; changing the flag, class, management or ownership of certain Navios Holdings’ vessels; changing the commercial and technical management of certain Navios Holdings’ vessels; selling or changing the ownership of certain Navios Holdings’ vessels; and subordinating the obligations under the credit facilities to any general and administrative costs relating to the vessels. The credit facilities also require the vessels to comply with the ISM Code and ISPS Code and to maintain valid safety management certificates and documents of compliance at all times. Additionally, the credit facilities require compliance with the covenants contained in the indentures governing the 2022 Senior Secured Notes and the 2022 Notes. Among other events, it will be an event of default under the credit facilities if the financial covenants are not complied with or if Angeliki Frangou and her affiliates, together, own less than 20% of the outstanding share capital of Navios Holdings.
2022 Notes \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	The guarantees of the Company's subsidiaries that own mortgaged vessels are senior secured guarantees and the guarantees of the Company's subsidiaries that do not own mortgaged vessels are senior unsecured guarantees. In addition, the 2022 Co-Issuers have the option to redeem the 2022 Notes in whole or in part, at any time on or after January 15, 2017, at a fixed price of 105.531%, which price declines ratably until it reaches par in 2020.
Debt Instrument Covenant Description	Furthermore, upon occurrence of certain change of control events, the holders of the 2022 Notes may require the 2022 Co-Issuers to repurchase some or all of the 2022 Notes at 101% of their face amount. The 2022 Notes contain covenants, which among other things, limit the incurrence of additional indebtedness, issuance of certain preferred stock, the payment of dividends, redemption or repurchase of capital stock or making restricted payments and investments, creation of certain liens, transfer or sale of assets, entering into certain transactions with affiliates, merging or consolidating or selling all or substantially all of the 2022 Co-Issuers' properties and assets and creation or designation of restricted subsidiaries. The 2022 Co-Issuers were in compliance with the covenants as of December 31, 2017.
Other long-term loans \| Navios Logistics
Debt Instrument [Line Items]
Repayment terms	The loan facility bears interest at a fixed rate of 600 basis points. The loan is repayable in monthly installments of $6 each and the final repayment must occur prior to August 10, 2021.
2022 Logistics Senior Notes \| Navios Logistics
Debt Instrument [Line Items]
Repayment terms	The Logistics Co-Issuers have the option to redeem the 2022 Logistics Senior Notes in whole or in part, at their option, at any time on or after May 1, 2017, at a fixed price of 105.438%, which price declines ratably until it reaches par in 2020. In addition, upon the occurrence of certain change of control events, the holders of the 2022 Logistics Senior Notes will have the right to require the Logistics Co-Issuers to repurchase some or all of the 2022 Logistics Senior Notes at 101% of their face amount, plus accrued and unpaid interest to the repurchase date.
Debt Instrument Covenant Description	The indenture governing the 2022 Logistics Senior Notes contains covenants which, among other things, limit the incurrence of additional indebtedness, issuance of certain preferred stock, the payment of dividends in excess of 6% per annum of the net proceeds received by or contributed to Navios Logistics in or from any public offering, redemption or repurchase of capital stock or making restricted payments and investments, creation of certain liens, transfer or sale of assets, entering into transactions with affiliates, merging or consolidating or selling all or substantially all of Navios Logistics’ properties and assets and creation or designation of restricted subsidiaries.
Secured debt
Debt Instrument [Line Items]
Minimum liquidity	$ 30,000
Secured debt \| Minimum
Debt Instrument [Line Items]
Value to loan ratio	1.1
Net total debt to assets	0.75
Secured debt \| Maximum
Debt Instrument [Line Items]
Value to loan ratio	1.35
Net total debt to assets	0.8
Secured debt \| Maximum \| Covenants waived up to four quarters
Debt Instrument [Line Items]
Net total debt to assets	0.9
Loan Facility Credit Agricole ($40,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the outstanding amount under the loan facility was repayable in one quarterly installment of $2,411, followed by seven semi-annual equal installments of $1,205 with a final balloon payment of $6,810 on the last payment date.
Loan Facility Credit Agricole ($23,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the facility is repayable in one quarterly installment of $681, followed by nine semi-annual equal installments of $681, with a final balloon payment of $7,264 on the last payment date.
Loan Facility Credit Agricole ($23,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the outstanding amount under the loan facility was repayable in one quarterly installment of $700 after the drawdown date, followed by nine semi-annual equal installments of $700, with a final balloon payment of $7,450 on the last payment date.
Loan Facility Credit Agricole ($22,500) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	The first tranche is repayable in one quarterly installment of $563, followed by seven equal semi-annual installments of $563, with a final balloon payment of $2,812 on the last repayment date. The second tranche is repayable in one quarterly installment of $1,125, followed by seven equal semi-annual installments of $563, with a final balloon payment of $2,812 on the last repayment date.
Loan Facility DVB Bank SE ($72,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the first tranche is repayable in nine quarterly installments of $362, with a final balloon payment of $14,400 on the last repayment date, the second tranche is repayable in ten quarterly installments of $269, with a final balloon payment of $6,354 on the last repayment date and the third tranche is repayable in ten quarterly installments of $469, with a final balloon payment of $18,750 on the last repayment date.
Loan Facility DVB Bank SE ($40,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the facility is repayable in 15 quarterly installments of $730, with a final balloon payment of $7,302 payable on the last repayment date.
Loan Facility Alpha Bank ($31,000) \| Navios Holdings borrowings
Debt Instrument [Line Items]
Repayment terms	As of December 31, 2017, the facility is repayable in 20 quarterly installments of $450, with a final balloon payment of $16,600 on the last repayment date.

Fair Value of Financial Instruments - Fair Value (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents - Book Value	$ 127,632	$ 135,992	$ 163,412	$ 247,556
Cash and cash equivalents - Fair Value	127,632	135,992
Restricted cash - Book Value	6,558	5,386	$ 13,480
Restricted cash - Fair Value	6,558	5,386
Investments in available-for-sale securities - Book Value	238	0
Investments in available-for-sale securities - Fair Value	238	0
Loan receivable from affiliate companies - Book Value	30,112	23,008
Loan receivable from affiliate companies - Fair Value	30,112	23,008
Long-term receivable from affiliate companies - Book Value	0	11,105
Long-term receivable from affiliate companies - Fair Value	0	11,105
Capital lease obligations, including current portion - Book Value	0	(17,617)
Capital lease obligations, including current portion - Fair Value	0	(17,617)
Senior and ship mortgage notes, net - Book Value	(1,301,999)	(1,296,537)
Senior and ship mortgage notes, net - Fair Value	(1,181,838)	(974,170)
Long-term debt, including current portion - Book Value	(380,489)	(304,682)
Long-term debt, including current portion - Fair Value	(389,332)	(308,080)
Loan payable to affiliate company - Book Value	0	(49,876)
Loan payable to affiliate company - Fair Value	0	(51,240)
Long-term payable to affiliate companies - Book Value	(76,872)	(6,399)
Long-term payable to affiliate companies - Fair Value	$ (76,872)	$ (6,399)

Fair Value of Financial Instruments - Recurring Measurements (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Investments in available-for-sale securities	$ 238	$ 0
Fair Value, Measurements, Recurring
Assets
Investments in available-for-sale securities	238
Total	238
Quoted Prices in Active Markets for Identical Assets (Level I) \| Fair Value, Measurements, Recurring
Assets
Investments in available-for-sale securities	238
Total	$ 238

Fair Value of Financial Instruments - Assets measured at Fair Value on a Non-Recurring Basis (Table) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Vessels, port terminals and other fixed assets, net	$ 16,500
Investments in affiliates		$ 148,095
Quoted Prices in Active Markets for Identical Assets (Level I)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Investments in affiliates		$ 148,095
Significant Other Observable Inputs (Level II)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Vessels, port terminals and other fixed assets, net	$ 16,500

Fair Value of Financial Instruments - Non-Recurring Measurements (Table) (Details) - USD ($)
$ in Thousands

Dec. 31, 2017

Dec. 31, 2016

Investments in available-for-sale securities

$ 127,632

$ 135,992

Restricted cash

6,558

5,386

238

Loan receivable from affiliate companies

30,112

23,008

Long-term receivable from affiliate companies

11,105

Senior and ship mortgage notes

(1,181,838)

(974,170)

Capital lease obligations, including current portion

(17,617)

Long-term debt, including current portion

(389,332)

(308,080)

Loan payable to affiliate company

(51,240)

Long-term payable to affiliate companies

(76,872)

(6,399)

Fair Value, Measurements, Nonrecurring

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Investments in available-for-sale securities

127,632

135,992

Restricted cash

6,558

5,386

238

Loan receivable from affiliate companies

^[1]

30,112

23,008

Long-term receivable from affiliate companies

^[1]

11,105

Senior and ship mortgage notes

(1,181,838)

(974,170)

Capital lease obligations, including current portion

^[2]

(17,617)

Long-term debt, including current portion

^[2]

(389,332)

(308,080)

Loan payable to affiliate company

^[1]

(51,240)

Long-term payable to affiliate companies

^[1]

(76,872)

(6,399)

(Level I) | Fair Value, Measurements, Nonrecurring

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]