DELIVERY AND DISPOSAL OF VESSELS (Details) - USD ($) $ in Thousands																	12 Months Ended
	Nov. 29, 2017	Nov. 07, 2017	Oct. 30, 2017	Oct. 18, 2017	Sep. 15, 2017	Aug. 15, 2017	Aug. 09, 2017	Aug. 07, 2017	Aug. 01, 2017	Jun. 13, 2017	May 13, 2017	Feb. 01, 2017	Dec. 19, 2016	Aug. 25, 2016	Aug. 05, 2016	Feb. 17, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 20, 2017
DELIVERY OF VESSELS
Loss on disposal of vessels, net																	$ 139,836	$ 24,169	$ 805
Gener8 Zeus
DELIVERY OF VESSELS
Gross proceeds from sale of vessel		$ 53,000
Loss on disposal of vessels, net																	15,500
Gener8 Argus
DELIVERY OF VESSELS
Gross proceeds from sale of vessel			$ 11,000
Loss on disposal of vessels, net																	8,100
Gener8 Poseidon
DELIVERY OF VESSELS
Gross proceeds from sale of vessel	$ 21,500
Loss on disposal of vessels, net																	13,000
Gener8 Pericles
DELIVERY OF VESSELS
Gross proceeds from sale of vessel				$ 11,000
Loss on disposal of vessels, net																	6,600
Gener8 Elektra
DELIVERY OF VESSELS
Gross proceeds from sale of vessel						$ 10,000
Loss on disposal of vessels, net																	5,900
Gener8 Phoenix and Gener8 Horn
DELIVERY OF VESSELS
Loss on disposal of vessels, net																	16,500
Gener8 Phoenix
DELIVERY OF VESSELS
Gross proceeds from sale of vessel							$ 7,800
Loss on disposal of vessels, net																	8,500
Gener8 Horn
DELIVERY OF VESSELS
Gross proceeds from sale of vessel									$ 8,000
Loss on disposal of vessels, net																	8,000
Gener8 Orion
DELIVERY OF VESSELS
Gross proceeds from sale of vessel										$ 13,000
Loss on disposal of vessels, net																	10,000
Gener8 Theseus
DELIVERY OF VESSELS
Gross proceeds from sale of vessel								$ 81,000
Loss on disposal of vessels, net																	31,900
Gener8 Noble
DELIVERY OF VESSELS
Gross proceeds from sale of vessel					$ 81,000
Loss on disposal of vessels, net																	25,400
Gener8 Daphne
DELIVERY OF VESSELS
Gross proceeds from sale of vessel											$ 10,500
Loss on disposal of vessels, net																	5,100
Gener8 Ulysses
DELIVERY OF VESSELS
Gross proceeds from sale of vessel												$ 30,500
Loss on disposal of vessels, net																		6,900
Gener8 Spyridon
DELIVERY OF VESSELS
Gross proceeds from sale of vessel													$ 13,900
Loss on disposal of vessels, net																		7,100
Genmar Victory
DELIVERY OF VESSELS
Gross proceeds from sale of vessel														$ 29,000
Loss on disposal of vessels, net																		7,300
Genmar Vision
DELIVERY OF VESSELS
Gross proceeds from sale of vessel															$ 28,000
Loss on disposal of vessels, net																		$ 3,200
Gener8 Consul
DELIVERY OF VESSELS
Gross proceeds from sale of vessel																$ 17,500
Loss on impairment of vessels held for sale																			$ 500
Gener8 Neptune | Gener 8 Neptune LLC
DELIVERY OF VESSELS
Purchase price of vessel per agreement																				$ 72,500
Gener8 Athena | Gener8 Athena LLC
DELIVERY OF VESSELS
Purchase price of vessel per agreement																				72,800
Gener8 Hera | Gener8 Hera LLC
DELIVERY OF VESSELS
Purchase price of vessel per agreement																				$ 75,600
Korean Export Credit Facility | Gener8 Hector | Gener8 Hector LLC
DELIVERY OF VESSELS
Borrowings to Fund Vessel's Delivery																	49,500
Korean Export Credit Facility | Gener8 Ethos | Gener8 Ethos LLC
DELIVERY OF VESSELS
Borrowings to Fund Vessel's Delivery																	50,631
Korean Export Credit Facility | Gener8 Nestor | Gener8 Nestor LLC
DELIVERY OF VESSELS
Borrowings to Fund Vessel's Delivery																	48,095
Korean Export Credit Facility | Gener8 Theseus
DELIVERY OF VESSELS
Repayments of debt								$ 50,100
Korean Export Credit Facility | Gener8 Noble
DELIVERY OF VESSELS
Repayments of debt					$ 50,400
Refinancing Facility | Gener8 Zeus
DELIVERY OF VESSELS
Repayments of debt		$ 34,300
Refinancing Facility | Gener8 Argus
DELIVERY OF VESSELS
Repayments of debt			$ 7,700
Refinancing Facility | Gener8 Poseidon
DELIVERY OF VESSELS
Repayments of debt	$ 14,100
Refinancing Facility | Gener8 Pericles
DELIVERY OF VESSELS
Repayments of debt				$ 7,800
Refinancing Facility | Gener8 Elektra
DELIVERY OF VESSELS
Repayments of debt						$ 7,600
Refinancing Facility | Gener8 Phoenix
DELIVERY OF VESSELS
Repayments of debt							$ 7,600
Refinancing Facility | Gener8 Horn
DELIVERY OF VESSELS
Repayments of debt									$ 8,200
Refinancing Facility | Gener8 Orion
DELIVERY OF VESSELS
Repayments of debt										$ 11,100
Refinancing Facility | Gener8 Daphne
DELIVERY OF VESSELS
Repayments of debt											$ 8,100
Refinancing Facility | Gener8 Ulysses
DELIVERY OF VESSELS
Repayments of debt												$ 20,000
Refinancing Facility | Gener8 Spyridon
DELIVERY OF VESSELS
Repayments of debt													$ 11,700
Refinancing Facility | Genmar Victory
DELIVERY OF VESSELS
Repayments of debt														$ 19,400
Refinancing Facility | Genmar Vision
DELIVERY OF VESSELS
Repayments of debt															$ 19,400
Refinancing Facility | Gener8 Consul
DELIVERY OF VESSELS
Repayments of debt																$ 9,800
2017 Asset Under Construction | Gener8 Hector
DELIVERY OF VESSELS
Accounts Payable																	0
2017 Asset Under Construction | Gener8 Ethos
DELIVERY OF VESSELS
Accounts Payable																	0
2017 Asset Under Construction | Gener8 Nestor
DELIVERY OF VESSELS
Accounts Payable																	$ 0