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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	$ 26,486us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent
Predecessor
Schedule of Investments
Fair value of investment in capital stock			77,570us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Jinhui Shipping and Transportation Limited
Schedule of Investments
Investment in the capital stock (in shares)	16,335,100us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember
Fair value of investment in capital stock	26,414us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember
Impairment of investment	0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember
Jinhui Shipping and Transportation Limited | Predecessor
Schedule of Investments
Investment in the capital stock (in shares)			16,335,100us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Fair value of investment in capital stock			77,488us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Impairment of investment		0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-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)	3,355us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Fair value of investment in capital stock	72us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Impairment of investment	0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Korea Line Corporation | Predecessor
Schedule of Investments
Investment in the capital stock (in shares)			3,355us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Fair value of investment in capital stock			82us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Impairment of investment		$ 0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	$ 0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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