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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jul. 09, 2014 Predecessor | Jul. 09, 2014 Predecessor | Sep. 30, 2013 Predecessor | Jul. 09, 2014 Predecessor | Sep. 30, 2013 Predecessor | Dec. 31, 2013 Predecessor
Vessels, net |  |  |  |  |  |  |
Estimated useful life | 25 years |  |  |  |  |  |
Estimated life of average scrap value of steel | 15 years |  |  |  |  |  |
Depreciation expense | $ 17,221 |  | $ 3,039 | $ 33,591 | $ 71,756 | $ 99,432 |
Estimated scrap value (in dollars per lightweight ton) | 310 | 245 |  |  |  |  |
Decrease in depreciation expense | 735 |  |  |  |  |  |
Change to basic and diluted net loss per share as a result of decrease in depreciation | $ 0.02 |  |  |  |  |  |
Basic and diluted net loss per share if no change to estimated scrap value | $ (0.32) |  |  |  |  |  |
Deferred revenue |  |  |  |  |  |  |
Accrual related to estimated customer claims | $ 587 |  |  |  |  |  | $ 536

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