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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Vessels, net |  |  |  |  |
Estimated useful life |  |  | 25 years |  |
Depreciation expense | $ 34,557 | $ 33,102 | $ 68,717 | $ 65,841 |
Estimated scrap value (in dollars per lightweight ton) |  |  | 245 |  |
Deferred revenue |  |  |  |  |
Accrual related to estimated customer claims | $ 459 |  | $ 459 |  | $ 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 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
- 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