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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) item customer | Dec. 31, 2019 customer item | Dec. 31, 2018 customer
Concentration Risk |  |  |
Number of financial institutions with which the entity maintains its cash and cash equivalents | item | 5 | 4 |
Cash insured by financial institutions | $ | $ 0 |  |
Voyage Revenues | Customer Concentration Risk |  |  |
Concentration Risk |  |  |
Number of customers | 166 | 170 | 182
Major Customers | 0 | 0 | 0

X
- Definition Represents the number customers of the entity from which revenue was earned. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of financial institutions with which the entity maintains its cash and cash equivalents. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of external customers from which the entity generated 10 percent or more of revenues. + References No definition available. + Details
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Namespace Prefix: | gnk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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Data Type: | xbrli:stringItemType
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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