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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jul. 09, 2014
Dec. 31, 2014
Mar. 15, 2010
item
Dec. 31, 2014
Aug. 07, 2014
Aug. 06, 2014
Dec. 18, 2014
Dec. 19, 2013
Dec. 13, 2012
Jul. 05, 2005
May 17, 2012
Mar. 13, 2014
Mar. 03, 2010
Predecessor                              
Number of Shares                              
Forfeited/Cancelled (in shares) (21,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
MIP Warrants                              
Additional disclosures                              
Total fair value of outstanding awards upon emergence from bankruptcy             54,436gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingTotalFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
               
Genco Shipping and Trading Limited 2005 Equity Incentive Plan | Predecessor                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards                       2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005EquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
     
2005 and 2012 GS&T Plans | Predecessor                              
Amortization                              
Number of anniversaries in which award vests     4 years                        
Number of Shares                              
Balance at the beginning of the period (in shares) 1,108,762us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
936,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
880,465us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
880,465us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                     
Granted (in shares) 200,634us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
464,175us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Vested (in shares) (407,431)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(290,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(880,465)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                       
Forfeited/Cancelled (in shares) (21,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Balance at the end of the period (in shares) 880,465us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,108,762us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Weighted Average Grant Date Price                              
Balance at the beginning of the period (in dollars per share) 9.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
14.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 7.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 7.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                     
Granted (in dollars per share) 1.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Vested (in dollars per share) 9.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
13.49us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 7.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                       
Forfeited/Cancelled (in dollars per share) 5.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
6.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Balance at the end of the period (in dollars per share) 7.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
9.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Additional disclosures                              
Total fair value of shares vested 943us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
733us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
691us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                       
Genco Shipping and Trading Limited 2012 Equity Incentive Plan | Predecessor                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards                         3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2012EquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Baltic Trading Plan                              
Number of Shares                              
Granted (in shares)       1,086,345us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                     
Vested (in shares)       (525,930)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                     
Balance at the end of the period (in shares)       1,941,844us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
  1,941,844us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                 
Weighted Average Grant Date Price                              
Granted (in dollars per share)       $ 2.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                     
Vested (in dollars per share)       $ 7.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                     
Balance at the end of the period (in dollars per share)       $ 3.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
  $ 3.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                 
Baltic Trading Plan | Baltic Trading Limited                              
Amortization                              
Number of anniversaries in which award vests in connection with IPO         4gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingInConnectionWithIPOInNumberOfAnniversaries
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                   
Number of anniversaries in which award vests not in connection with IPO       4gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNotInConnectionWithIPOInNumberOfAnniversaries
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                     
Additional disclosures                              
Total fair value of shares vested           1,168us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                 
Unrecognized compensation cost related to nonvested stock awards [Abstract]                              
Unrecognized compensation cost       5,273us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
  5,273us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
                 
Weighted-average period for recognition of unrecognized compensation cost       3 years 3 months 11 days                      
Baltic Trading Plan | Predecessor                              
Number of Shares                              
Balance at the beginning of the period (in shares) 664,249us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
545,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Granted (in shares) 998,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
299,999us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Vested (in shares) (281,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(181,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Balance at the end of the period (in shares) 1,381,429us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
664,249us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Weighted Average Grant Date Price                              
Balance at the beginning of the period (in dollars per share) 7.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
11.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Granted (in dollars per share) 5.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
3.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Vested (in dollars per share) 8.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
11.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Balance at the end of the period (in dollars per share) 6.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
7.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                         
Baltic Trading Plan | Predecessor | Baltic Trading Limited                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards                           6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Additional disclosures                              
Total fair value of shares vested 1,194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
663us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,143us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_PlanNameAxis
= gnk_BalticTradingPlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                       
2014 MIP Plan                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards       9,668,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  9,668,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  250,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
             
Percentage of common stock outstanding ( In percent)           1.80%gnk_PercentageOfSharesInPostEmergenceCommonStockOutstanding
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Volatility rate ( as a percent)             43.91%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Volatility rate term             6 years                
Risk-free interest rate ( as a percent)             1.85%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Dividend rate ( as a percent)             0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Percentage of warrant vest for anniversaries of the grant date             33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Amortization                              
Number of anniversaries in which award vests               3 years              
Number of Shares                              
Granted (in shares)           1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Balance at the end of the period (in shares)       1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  1,110,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Weighted Average Grant Date Price                              
Granted (in dollars per share)           $ 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Balance at the end of the period (in dollars per share)       $ 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  $ 20.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Additional disclosures                              
Total fair value of shares vested           0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Unrecognized compensation cost related to nonvested stock awards [Abstract]                              
Unrecognized compensation cost       16,748us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  16,748us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Weighted-average period for recognition of unrecognized compensation cost       2 years 7 months 6 days                      
2014 MIP Plan | MIP Warrants                              
Amortization                              
2015       25,941us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  25,941us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
2016       11,496us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  11,496us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
2017       3,609us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  3,609us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Number of Shares                              
Granted (in shares)           8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Balance at the end of the period (in shares)       8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  8,557,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Weighted Average Exercise price                              
Granted (in dollars per share)           $ 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Outstanding at the end of the period (in dollars per share)       $ 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  $ 30.31gnk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Weighted-average remaining contractual life       5 years 7 months 6 days                      
Weighted Average Grant Date Price                              
Granted (in dollars per share)           $ 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Balance at the end of the period (in dollars per share)       $ 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  $ 6.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
Unrecognized compensation cost related to nonvested stock awards [Abstract]                              
Unrecognized compensation cost       $ 41,046us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
  $ 41,046us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
                 
2014 MIP Plan | MIP Warrants | $25.91 Warrants                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards             2,380,664us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Strike price (in dollars per share)             25.91us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Fair value of warrant (in dollars per share)             7.22gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierOneMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
2014 MIP Plan | MIP Warrants | $28.73 Warrants                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards             2,467,009us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Strike price (in dollars per share)             28.73us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Fair value of warrant (in dollars per share)             6.63gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierTwoMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
2014 MIP Plan | MIP Warrants | $34.19 Warrants                              
Nonvested Stock Awards                              
Aggregate number of shares of common stock available for awards             3,709,788us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Strike price (in dollars per share)             34.19us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Fair value of warrant (in dollars per share)             5.63gnk_FairValueOfWarrant
/ us-gaap_AwardTypeAxis
= gnk_MIPWarrantsTierThreeMember
/ us-gaap_ClassOfWarrantOrRightAxis
= gnk_ManagementIncentivePlanWarrantsIssueMember
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2014ManagementIncentivePlanMember
               
Peter C. Georgiopoulos, Chairman of Board | Baltic Trading Limited                              
Number of Shares                              
Granted (in shares)                 700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
           
Peter C. Georgiopoulos, Chairman of Board | Predecessor | Baltic Trading Limited                              
Number of Shares                              
Granted (in shares)                   539,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
166,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= gnk_BalticTradingLimitedMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
       
Peter C. Georgiopoulos, Chairman of Board | 2005 and 2012 GS&T Plans | Predecessor                              
Amortization                              
Number of anniversaries in which award vests, which are not granted as part of grants to all directors     10 years                        
Number of Shares                              
Granted (in shares)                     100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= gnk_GencoShippingAndTradingLimited2005And2012EquityIncentivePlansMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember