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INVESTMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jul. 09, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Investments |  |  |  |
Fair value of investment in capital stock | $ 26,486 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent |  |  |
Predecessor |  |  |  |
Schedule of Investments |  |  |  |
Fair value of investment in capital stock |  |  | 77,570 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Jinhui Shipping and Transportation Limited |  |  |  |
Schedule of Investments |  |  |  |
Investment in the capital stock (in shares) | 16,335,100 us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember |  |  |
Fair value of investment in capital stock | 26,414 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember |  |  |
Impairment of investment | 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember |  |  |
Jinhui Shipping and Transportation Limited | Predecessor |  |  |  |
Schedule of Investments |  |  |  |
Investment in the capital stock (in shares) |  |  | 16,335,100 us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Fair value of investment in capital stock |  |  | 77,488 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Impairment of investment |  | 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Korea Line Corporation |  |  |  |
Schedule of Investments |  |  |  |
Investment in the capital stock (in shares) | 3,355 us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember |  |  |
Fair value of investment in capital stock | 72 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember |  |  |
Impairment of investment | 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember |  |  |
Korea Line Corporation | Predecessor |  |  |  |
Schedule of Investments |  |  |  |
Investment in the capital stock (in shares) |  |  | 3,355 us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Fair value of investment in capital stock |  |  | 82 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Impairment of investment |  | $ 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | $ 0 us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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