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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 09, 2014 $ / item | Jun. 30, 2015 USD ($) $ / shares | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) $ / shares $ / item | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Vessels, net |  |  |  |  |  |
Estimated useful life |  |  |  | 25 years |  |
Depreciation expense |  | $ 18,730 |  | $ 37,697 |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item |  |  |  | 310 |  |
Estimated life of average scrap value of steel |  |  |  | 15 years |  |
Decrease in depreciation expense |  | $ 796 |  | $ 1,583 |  |
Change to basic and diluted net loss per share as a result of decrease in depreciation | $ / shares |  | $ 0.01 |  | $ 0.02 |  |
Basic and diluted net loss per share if no change to estimated scrap value | $ / shares |  | $ (0.68) |  | $ (1.32) |  |
Deferred revenue |  |  |  |  |  |
Accrual related to estimated customer claims |  | $ 829 |  | $ 829 |  | $ 662
Predecessor |  |  |  |  |  |
Vessels, net |  |  |  |  |  |
Depreciation expense |  |  | $ 34,557 |  | $ 68,717 |
Estimated scrap value (in dollars per lightweight ton) | $ / item | 245 |  |  |  |  |

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
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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
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Namespace Prefix: | gnk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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

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- References No definition available. + 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
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Namespace Prefix: | gnk_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |