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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) | 6 Months Ended | 12 Months Ended
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Dec. 31, 2014 customer item | Jul. 09, 2014 customer item derivative | Dec. 31, 2013 customer item derivative | Dec. 31, 2012 customer
Concentration Risk [Line Items] |  |  |  |
Percentage of revenue earned (as a percent) | 100.00%gnk_ConcentrationRiskPercentageOfRevenueEarnedFromCustomers |  |  |
Number of customers | 44 gnk_ConcentrationRiskNumberOfCustomers |  |  |
Number of financial institutions with which the entity maintains its cash and cash equivalents | 3 gnk_ConcentrationRiskNumberOfFinancialInstitutionsWithWhichEntityMaintainsCashAndCashEquivalents |  |  |
Number of interest rate swaps | 0 us-gaap_NumberOfInterestRateDerivativesHeld |  |  |
Voyage Revenues |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Major Customers | 2 gnk_EntityWideRevenueMajorCustomerNumber / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember |  |  |
Concentration risk percentage (as a percent) | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember |  |  |
Voyage Revenues | Cargill International S.A. |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (as a percent) | 17.06%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_CargillInternationalSAMember |  |  |
Voyage Revenues | Swissmarine Services S.A. |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (as a percent) | 22.52%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_SwissmarineServicesSAMember |  |  |
Predecessor |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of revenue earned (as a percent) |  | 100.00%gnk_ConcentrationRiskPercentageOfRevenueEarnedFromCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 100.00%gnk_ConcentrationRiskPercentageOfRevenueEarnedFromCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 100.00%gnk_ConcentrationRiskPercentageOfRevenueEarnedFromCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of customers |  | 33 gnk_ConcentrationRiskNumberOfCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 48 gnk_ConcentrationRiskNumberOfCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 43 gnk_ConcentrationRiskNumberOfCustomers / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Number of financial institutions with which the entity maintains its cash and cash equivalents |  |  | 4 gnk_ConcentrationRiskNumberOfFinancialInstitutionsWithWhichEntityMaintainsCashAndCashEquivalents / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Number of interest rate swaps |  |  | 4 us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Predecessor | Voyage Revenues |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Major Customers |  | 2 gnk_EntityWideRevenueMajorCustomerNumber / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 3 gnk_EntityWideRevenueMajorCustomerNumber / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1 gnk_EntityWideRevenueMajorCustomerNumber / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Concentration risk percentage (as a percent) |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Voyage Revenues | Cargill International S.A. |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (as a percent) |  | 19.37%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_CargillInternationalSAMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 21.45%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_CargillInternationalSAMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 31.27%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_CargillInternationalSAMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor | Voyage Revenues | Swissmarine Services S.A. |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (as a percent) |  | 20.67%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_SwissmarineServicesSAMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 18.73%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_SwissmarineServicesSAMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Predecessor | Voyage Revenues | Pacific Basin Chartering Ltd. |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage (as a percent) |  |  | 10.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = gnk_VoyageRevenuesMember / us-gaap_MajorCustomersAxis = gnk_PacificBasinCharteringLtdMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |

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