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FAIR VALUE OF FINANCIAL INSTRUMENTS - NONRECURRING (Details) - item | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Fair Value, Measurements, Nonrecurring |  |
Fair value of financial instruments |  |
Number of vessels written down as part of impairment | 5 | 10

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- Definition Number of vessels written down as part of impairment recorded during the period. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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: |