Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Mar. 10, 2017	Jun. 30, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	Gener8 Maritime, Inc.
Entity Central Index Key	0001443799
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 282.8
Entity Common Stock, Shares Outstanding		82,960,194
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY