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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of vessel assets (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Oct. 04, 2024	Jul. 16, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Summary of Significant Accounting Policies
Impairment of vessel assets			$ 651	$ 5,634	$ 651	$ 5,634
Loss on disposal of replaced equipment on certain vessels			$ 651		$ 651
Genco Hadrian
Summary of Significant Accounting Policies
Impairment of vessel assets				5,634		5,634
Sale of assets	$ 25,000	$ 25,000
Broker commission (as a percent)	2.00%	2.00%
Net sales price of vessel				$ 24,500		$ 24,500

X

- Definition

Represents brokerage commission payable in percentage to the third party.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the sale price of vessel.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the line items for significant accounting policies schedule.

+ References

No definition available.

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X

- Definition

Amount of write-down of vessel assets, including but not limited to, assets to be disposed of and held-for-use.

+ References

No definition available.

+ Details

Name:	gnk_VesselAssetImpairmentCharges
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

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