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DEBT - $98 Credit Facility and Term Loans (Details) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 29, 2016 USD ($) | Mar. 11, 2016 USD ($) | Nov. 10, 2015 USD ($) | Nov. 04, 2015 USD ($) subsidiary | Aug. 03, 2015 USD ($) | Jul. 14, 2015 USD ($) | Apr. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) item | Jul. 09, 2014 USD ($) | Aug. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) item | Aug. 31, 2015 item | Jul. 31, 2015 USD ($) item | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) item | Jul. 01, 2016 | Jun. 29, 2016 USD ($) | Jun. 28, 2016 | Sep. 30, 2010 item | Aug. 20, 2010 USD ($) | Aug. 12, 2010 USD ($) item
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  | $ 579,023,000 |  |  | $ 553,301,000 |  | $ 579,023,000 |  |  |  |  |  |
$98 Million Credit Facility Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,000,000 |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120.00% | 140.00% |  |  |
$98 Million Credit Facility Commitment Letter | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash requirement through the end of the third quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |  |  |  |
Amended And Restated Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in the minimum consolidated net worth ratio |  |  |  |  |  | $ 30,730,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net worth to be maintained |  |  |  |  |  | 270,150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended Commitment Letter | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash requirement through the end of the third quarter |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |
Secured Debt | $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 22,000,000 |  |  |  | $ 22,000,000 | 22,000,000 |  |  | $ 22,000,000 | $ 22,000,000 | 22,000,000 |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.00% |  |  | 125.00% |  |  |  |  |
Final payment amount |  |  |  |  |  |  |  |  |  | 13,375,000 |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | 18,249,000 |  |  | 17,550,000 |  | 18,249,000 |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,550,000 |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  |  |  |  |  |  |  | $ 375,000 |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $22 Million Term Loan Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate for interest payable |  |  |  |  |  |  |  |  |  | three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Baltic Trading $33 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | 32,086,000 |  |  | 31,066,000 |  | 32,086,000 |  |  |  |  |  |
Number of vessels mortgaged | item |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | Baltic Trading $33 Million Term Loan Facility | Baltic Scorpion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  | 140.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  | $ 16,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |  | $ 100,000,000
Prepayment of amortization payment before due date | $ 1,923,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | 58,899,000 |  |  | 55,216,000 |  | $ 58,899,000 |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,216,000 |  |  |  |  |  |  |  |
Number of vessels acquired | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Paydown of debt |  |  |  |  |  |  |  |  | $ 1,923,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of upfront fees |  |  |  |  |  |  | $ 165,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Secured Debt | $253 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | 253,000,000 |  |  | 253,000,000 | 253,000,000 | $ 253,000,000 |  |  |  |  | $ 253,000,000 |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | 142,740,000 |  |  | 132,934,000 |  | 142,740,000 |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,934,000 |  |  |  |  |  |  |  |
Paydown of debt |  |  |  |  |  |  |  |  | 5,075,000 |  |  |  | $ 5,075,000 |  |  |  |  |  |  |  |  |
Payment of upfront fees |  |  |  |  |  |  | $ 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Number of vessels delivered pursuant to the agreement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  | 9,750,000 |  |  | 9,750,000 |  | 9,750,000 |  |  |  |  |  |
Prepayment of the outstanding indebtedness |  | $ 5,075,000 |  |  |  |  |  |  |  |  |  |  | $ 1,650,000 |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million and $253 Million Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash balance required per vessel owned |  |  |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum total debt outstanding to value adjusted total assets ratio |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of liquidity covenant amended |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum cash required to be maintained by each collateralized vessel |  |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period of available working capital lines |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt | $100 Million and $253 Million Term Loan Facilities | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate for interest payable, before increase (as a percent) |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility | $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 148,000,000 |  | $ 148,000,000 |  |  | $ 148,000,000 |  |  | 148,000,000 | 148,000,000 | 148,000,000 |  |  |  |  |  |
Minimum cash balance required per vessel owned |  |  |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,994,000 | 2,447,000 |  |  |  |  |  |  |
Drawdowns during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 115,000,000 |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 133,832,000 |  |  |  |  |  |  |  |
Commitment fee on unused daily average unutilized commitment (as a percent) |  |  |  |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels mortgaged | item |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unencumbered vessels adding as additional collateral to cover the shortfall of fair value | item |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility | $148 Million Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate for interest payable |  |  |  |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility | $98 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 98,000,000 |  |  |  |  |  |  | $ 98,000,000 |  |  | 98,000,000 |  | 98,000,000 |  |  |  |  |  |
Number of wholly owned subsidiaries | subsidiary |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drawdowns during the period |  |  | $ 98,271,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | 95,903,000 |  |  | 96,152,000 |  | 95,903,000 |  |  |  |  |  |
Debt classified as current liability |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,152,000 |  |  |  |  |  |  |  |
Period without fixed amortization schedule |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of periodic payment |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum collateral required for prepayment of loan (as a percent) |  |  |  | 182.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of collateral vessels |  |  |  | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  | $ 9,750,000 |  |  | 9,750,000 |  | $ 9,750,000 |  |  |  |  |  |
Line of Credit Facility | $98 Million Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reference rate for interest payable |  |  |  | three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin over reference rate (as a percent) |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility | $98 Million Credit Facility Commitment Letter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,000,000 |  |  |  | $ 98,000,000 |  |  |  |
Period from June 30, 2015 to December 30, 2015 | Secured Debt | 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period from December 31, 2015 to March 30, 2016 | Secured Debt | 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period from March 31, 2016 and thereafter | Secured Debt | 2014 Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 135.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up to June 30, 2016 | Secured Debt | $22 Million Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up to December 31, 2015 | Line of Credit Facility | $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After December 31, 2015 | Line of Credit Facility | $148 Million Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral security maintenance test (as a percent) |  |  |  |  |  | 140.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument before amendment. + References No definition available. + Details
Name: | gnk_DebtInstrumentBasisSpreadOnVariableRateBeforeAmendment
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the minimum cash required per vessel mortgaged under this facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantCashAndCashEquivalentAndRemainingBorrowingCapacityForWorkingCapitalPerVesselRequiredToBeMaintained
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate fair value of the mortgaged vessels to be maintained as a percentage of aggregate outstanding principal amount as per the terms of the credit facilities' covenants. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityCovenantFairMarketValueOfMortgagedVesselsAsPercentageOfAggregateOutstandingPrincipalAmount
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the minimum cash balance per vessel required to be maintained for vessels owned under the credit facility. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityMinimumCashBalanceRequiredPerVesselOwned
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the required payment amount under the line of credit facility due on final maturity date. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityPaymentAmountDueAtMaturity
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of upfront fee paid under the terms of credit facilities. + References No definition available. + Details
Name: | gnk_LineOfCreditFacilityPaymentOfUpfrontFee
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The maximum percentage of collateral required for prepayment of line of credit using excess cash flows. + References No definition available. + Details
Name: | gnk_LineOfCreditMaximumPercentageOfCollateralForPrepaymentOfLoan
Namespace Prefix: | gnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of collateral vessels, in which the loan is to be prepaid from earnings received from operations after deduction of costs, fees, expenses, interest, and fixed principal repayments under the facility; operating expenses relating to the vessels; and the Borrowers’ pro rata share of general and administrative expenses based on the number of vessels they own. + References No definition available. + Details
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