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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - 10Q (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Jul. 09, 2014 | Mar. 31, 2014 | Dec. 31, 2014
Vessels, net |  |  |  |
Estimated useful life | 25 years |  |  |
Estimated life of average scrap value of steel | 15 years |  |  |
Depreciation expense | $ 18,967 gnk_DepreciationOfVessels |  |  |
Estimated scrap value (in dollars per lightweight ton) | 310 gnk_VesselsEstimatedScrapValue |  |  |
Decrease in depreciation expense | 787 gnk_DecreaseInDepreciationExpenseAsResultOfIncreaseInEstimatedScrapValue |  |  |
Change to basic and diluted net loss per share as a result of decrease in depreciation | $ 0.01 gnk_IncreaseDecreaseInBasicAndDilutedNetIncomeLossPerShare |  |  |
Basic and diluted net loss per share if no change to estimated scrap value | $ (0.65)gnk_EarningsPerShareBasicAndDilutedIfNoChangeToScrapValue |  |  |
Deferred revenue |  |  |  |
Accrual related to estimated customer claims | 725 gnk_AccrualRelatedToEstimatedCustomerClaims |  |  | 662 gnk_AccrualRelatedToEstimatedCustomerClaims
Predecessor |  |  |  |
Vessels, net |  |  |  |
Depreciation expense |  |  | $ 34,160 gnk_DepreciationOfVessels / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |
Estimated scrap value (in dollars per lightweight ton) |  | 245 gnk_VesselsEstimatedScrapValue / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |

X
- Definition Represents the accrual related to estimated customer claims. + References No definition available. + Details
Name: | gnk_AccrualRelatedToEstimatedCustomerClaims
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the decrease in depreciation expense as a result of increase in estimated scrap value. + References No definition available. + Details
Name: | gnk_DecreaseInDepreciationExpenseAsResultOfIncreaseInEstimatedScrapValue
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the depreciation of vessels. + References No definition available. + Details
Name: | gnk_DepreciationOfVessels
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net (loss) income per share - basic and diluted (in dollars per share if no change to scrap value. + References No definition available. + Details
Name: | gnk_EarningsPerShareBasicAndDilutedIfNoChangeToScrapValue
Namespace Prefix: | gnk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase (decrease) in basic and diluted net income (loss) per share. + References No definition available. + Details
Name: | gnk_IncreaseDecreaseInBasicAndDilutedNetIncomeLossPerShare
Namespace Prefix: | gnk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of useful life of average scrap value of steel. + References No definition available. + Details
Name: | gnk_UsefulLifeOfAverageScrapValueOfSteel
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | gnk_VesselsAbstract
Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the estimated scrap value of vessels. + References No definition available. + Details
Name: | gnk_VesselsEstimatedScrapValue
Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the estimated useful life of vessels. + References No definition available. + Details
Name: | gnk_VesselsEstimatedUsefulLife
Namespace Prefix: | gnk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DeferredRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |