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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Maritime Equipment | Mar. 31, 2013 Maritime Equipment
Vessels, net |  |  |  |
Estimated useful life |  |  | 25 years |
Depreciation expense |  |  | $ 34,160 | $ 32,739
Estimated scrap value (in dollars per lightweight ton) |  |  | 245 |
Deferred revenue |  |  |  |
Accrual related to estimated customer claims | $ 579 | $ 536 |  |

X
- Definition Represents the accrual related to estimated customer claims. + References No definition available. + Details
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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
- Definition Represents the estimated scrap value of vessels. + References No definition available. + Details
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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: | gnk_VesselsLineItems
Namespace Prefix: | gnk_
Data Type: | xbrli:stringItemType
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