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LEASES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Oct. 14, 2024
Leases |  |  |
Sublease income | $ 306 | $ 306 |
Operating Lease Rent Expense Period From September 2027 To July 2031 | NEW YORK |  |  |
Leases |  |  |
Monthly rental payment |  |  | $ 70
Operating Lease Rent Expense Period From August 2031 to July 2036 | NEW YORK |  |  |
Leases |  |  |
Monthly rental payment |  |  | $ 74

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- Definition Represents the monthly payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease. + References No definition available. + Details
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Namespace Prefix: | gnk_
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Balance Type: | credit
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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479773/842-30-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |