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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Payment of PIK interest | $ 5,341 | $ 0

X
- Definition Represents cash outflow for PIK interest. + References No definition available. + Details
Name: | gnk_PaymentsForPaidInKindInterest
Namespace Prefix: | gnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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