Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230

Name:	us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disposal of Vessels (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
(Gain) loss on disposal of vessels
Gain (Loss) on sale of vessels	$ 7,712	$ 3,555	$ (1,210)
Genco Wisdom, Genco Reliance, Genco Carrier, Genco Success And Genco Prosperity
(Gain) loss on disposal of vessels
Gain (Loss) on sale of vessels	$ 7,712
Genco Marine, Genco Sugar, Genco Pioneer, Genco Leader, Genco Acheron
(Gain) loss on disposal of vessels
Gain (Loss) on sale of vessels		$ 3,555
Baltic Lion and Baltic Tiger
(Gain) loss on disposal of vessels
Gain (Loss) on sale of vessels			$ (1,210)