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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment $ / item	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 08, 2016 item
Segment reporting
Number of reportable segments | segment				1
Vessels, net
Estimated useful life				25 years
Depreciation and amortization	$ 18,185		$ 19,686	$ 36,358	$ 40,025
Estimated scrap value (in dollars per lightweight ton) | $ / item				310
Deferred revenue
Accrual related to estimated customer claims	481	$ 220		$ 481		$ 220
Number of categories of General administrative and management fees | item		2
Voyage expense recognition
Net gain (loss) on purchase and sale of bunker fuel and LCM adjustments	1,440		(1,508)	$ 935	(3,805)
Percentage of gross shipping income attributable to transportation beginning or ending in the U.S. will be subject to a 4% tax without allowance for deductions				50.00%
Percentage of tax without allowance for deductions on gross shipping income attributable to transportation beginning or ending in the U.S				4.00%
Gross transportation tax	61			$ 97		$ 0
Impairment of vessel assets
Impairment of vessel assets	3,339		67,594	3,339	69,278
Gain on disposal of vessels
Gain (Loss) on sale of vessels	1,343		(77)	7,712	(77)
Other operating income
Other operating income	0		182	0	182
Vessels
Vessels, net
Depreciation and amortization	16,892		18,541	33,598	37,675
Samsun
Other operating income
Other operating income			157		157
Genco Surprise
Impairment of vessel assets
Impairment of vessel assets	3,339			3,339
Genco Marine
Impairment of vessel assets
Impairment of vessel assets			0		1,684
Gain on disposal of vessels
Gain (Loss) on sale of vessels			(77)		(77)
Genco Prosperity Limited
Gain on disposal of vessels
Gain (Loss) on sale of vessels	$ 1,343
Genco Acheron, Genco Carrier, Genco Leader, Genco Pioneer, Genco Prosperity, Genco Reliance, Genco Success, Genco Sugar, Genco Wisdom
Impairment of vessel assets
Impairment of vessel assets			$ 67,594		$ 67,594
Number of vessels scrapped | item							9
Genco Wisdom, Genco Reliance, Genco Carrier, Genco Success And Genco Prosperity
Gain on disposal of vessels
Gain (Loss) on sale of vessels				$ 7,712

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