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INVESTMENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Investments
Fair value of investment in capital stock	$ 28,845us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent		$ 26,486us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent
Jinhui Shipping and Transportation Limited
Schedule of Investments
Investment in the capital stock (in shares)	16,335,100us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember		16,335,100us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember
Fair value of investment in capital stock	28,776us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_JinhuiShippingAndTransportationLimitedMember		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
Impairment of investment		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		3,355us-gaap_InvestmentOwnedBalanceShares / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Fair value of investment in capital stock	69us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember		72us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Impairment of investment	0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember
Korea Line Corporation | Predecessor
Schedule of Investments
Impairment of investment		$ 0us-gaap_ImpairmentOfInvestments / dei_LegalEntityAxis = gnk_KoreaLineCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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