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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 09, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 10, 2016 USD ($) | Jun. 08, 2016 USD ($) item
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  | $ 36,714 |  | $ 76,330 | $ 79,556 |  |
Deferred drydocking costs |  |  |  |  |  |  |
Amortization expense for drydocking |  | 330 |  | 4,113 | 2,877 |  |
Goodwill |  |  |  |  |  |  |
Goodwill impairment |  | 166,067 |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets | $ 32,536 | 0 |  | 69,278 | 39,893 |  |
Number of vessels scrapped | item |  |  |  |  |  |  | 9
(Gain) loss on disposal of vessels |  |  |  |  |  |  |
Gain (loss) on sale of vessels |  |  |  | $ 3,555 | (1,210) |  |
Minimum |  |  |  |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance |  |  |  | 30 months |  |  |
Maximum |  |  |  |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance |  |  |  | 60 months |  |  |
Genco Sugar, Genco Pioneer, Genco Leader, and Genco Acheron |  |  |  |  |  |  |
(Gain) loss on disposal of vessels |  |  |  |  |  |  |
Gain (loss) on sale of vessels |  |  |  | $ 3,555 |  |  |
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 |  |  |
Baltic Tiger and Baltic Lion |  |  |  |  |  |  |
(Gain) loss on disposal of vessels |  |  |  |  |  |  |
Gain (loss) on sale of vessels |  |  |  |  | (1,210) |  |
Genco Marine Limited | Genco Marine |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  | 1,684 | 4,497 |  |
Baltic Trading | Baltic Tiger and Baltic Lion |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  | 35,396 |  |
Detail of Fixed Assets, Excluding Vessels |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  | 119 |  | 388 | 284 |  |
Vessels |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  | $ 36,265 |  | $ 71,829 | $ 76,395 |  |
Furniture and Fixtures |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Useful lives |  |  |  | 5 years |  |  |
Vessel Equipment | Minimum |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Useful lives |  |  |  | 2 years |  |  |
Vessel Equipment | Maximum |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Useful lives |  |  |  | 15 years |  |  |
Computer equipment |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Useful lives |  |  |  | 3 years |  |  |
Predecessor |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  |  | $ 75,952 |  |  |  |
Deferred drydocking costs |  |  |  |  |  |  |
Amortization expense for drydocking |  |  | 3,738 |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill |  |  | 166,067 |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Impairment of vessel assets |  |  | 0 |  |  |  |
Predecessor | Detail of Fixed Assets, Excluding Vessels |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  |  | 458 |  |  |  |
Predecessor | Vessels |  |  |  |  |  |  |
Fixed assets, net |  |  |  |  |  |  |
Depreciation and amortization |  |  | $ 71,756 |  |  |  |
Secured Debt | $400 Million Credit Facility |  |  |  |  |  |  |
Impairment of vessel assets |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 400,000 |  | $ 400,000 | $ 400,000

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