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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of long-lived assets (Details) $ in Thousands								3 Months Ended	12 Months Ended
	Oct. 04, 2024 USD ($)	Jul. 16, 2024 USD ($)	Apr. 22, 2024 USD ($)	Apr. 02, 2024 USD ($)	Feb. 07, 2024 USD ($)	Dec. 21, 2023 USD ($)	Nov. 14, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($) $ / item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 item
Impairment of long-lived assets
Historical one-year time charter average period									10 years
Time charter average period									1 year
Estimated useful life									25 years
Fleet utilization (as a percent)									98.00%
Estimated scrap value (in dollars per lightweight ton) | $ / item									400
Impairment of vessel assets									$ 6,595	$ 41,719	$ 0
Loss on the disposal of replaced equipment									961	0	$ 0
Genco Claudius, Genco Commodus and Genco Maximus
Impairment of long-lived assets
Number impaired vessel assets | item													3
Impairment of vessel assets										28,102
Genco Claudius, Genco Commodus and Genco Maximus | Agreement to sell Genco Claudius, Genco Commodus and Genco Maximus
Impairment of long-lived assets
Impairment of vessel assets										13,617
Genco Maximus
Impairment of long-lived assets
Sale of assets				$ 22,800		$ 18,000
Broker commission (as a percent)				2.00%		1.00%
Net sales price of vessel										17,820
Genco Claudius
Impairment of long-lived assets
Sale of assets			$ 24,200			$ 18,500
Broker commission (as a percent)			2.00%			1.00%
Net sales price of vessel										18,315
Genco Commodus
Impairment of long-lived assets
Sale of assets					$ 19,500		$ 19,500
Broker commission (as a percent)					1.00%		1.00%
Net sales price of vessel										$ 19,305
Genco Hadrian
Impairment of long-lived assets
Impairment of vessel assets									$ 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
Genco Claudius and Genco Maximus
Impairment of long-lived assets
Vessel deposits retained due to termination of agreement								$ 3,650

X

- Definition

Represents brokerage commission payable in percentage to the third party.

+ References

No definition available.

+ Details

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X

- Definition

The fleet utilization percentage used to determine undiscounted cash flows.

+ References

No definition available.

+ Details

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X

- Definition

Period of historical one-year time charter average used to determine undiscounted future net cash flows.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loss on the disposal of replaced equipment.

+ References

No definition available.

+ Details

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X

- Definition

Number of vessels determined to be impaired.

+ References

No definition available.

+ Details

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X

- Definition

Represents the sale price of vessel.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Period of time charter average used to determine undiscounted future net cash flows.

+ References

No definition available.

+ Details

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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

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Balance Type:	debit
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X

- Definition

Represents the amount of vessel deposits retained due to termination of the agreement.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represents the estimated scrap value of vessels.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Definition

Represents the estimated useful life of vessels.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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Balance Type:	na
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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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