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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 16, 2015
Income Taxes
Ownership percentage held by each shareholder (as a percent)		5.00%
Percentage of shipping income attributable to transportation that begins or ends in the United States included in United States source shipping income		50.00%
Tax rate on 50% of shipping income if not qualified for Section 883		4.00%
Gross transportation tax		$ 365	$ 0	$ 0
Tax on branch profits		30.00%
Percentage of shipping income sourced to United States if attributable to transportation exclusively between United States ports		100.00%
Percentage of shipping income sourced to United States if no transportation is attributable to United States		0.00%
Total revenue earned			2,340	3,175
Taxable income		$ (58,725)	(217,048)	(252,547)
Income tax expense			709	1,821
Minimum
Income Taxes
Percentage of value of outstanding shares owned by the qualified shareholders		50.00%
Maximum
Income Taxes
Combined ownership held by 5% shareholders (as a percent)		50.00%
Percentage of shipping income attributable to transportation that begins or ends in the United States included in United States source shipping income		50.00%
Vessel Management Services
Income Taxes
Total revenue earned		$ 0	2,340	6,410
Taxable income			1,502	3,880
Income tax expense			709	1,753
Vessel Management Services | Intersegment Elimination
Income Taxes
Total revenue earned			$ 0	(3,235)
Genco Shipping Pte. Ltd.
Income Taxes
Income tax expense		$ 0
Forecast
Income Taxes
Federal tax rate (as a percent)	21.00%
Baltic Trading | Minimum
Income Taxes
Aggregate voting power held (as a percent)					50.00%
Baltic Trading | United States
Income Taxes
Income tax expense				$ 68

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