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DEBT - $133 Million Credit Facility (Details) - Secured Debt					3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($)	Jun. 15, 2020 USD ($)	Jun. 11, 2020 USD ($)	Aug. 14, 2018 USD ($) item	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
$133 Million Credit Facility
Line of Credit Facility
Maximum borrowing capacity					$ 133,000,000		$ 133,000,000
Drawdowns during the period								$ 24,000,000
Remaining borrowing capacity					17,320,000		17,320,000
Repayment of secured debt					$ 1,580,000	$ 1,700,000	$ 24,320,000	$ 3,280,000
$108 Million Credit Facility
Line of Credit Facility
Maximum borrowing capacity				$ 108,000,000
Term of facilities				5 years
$108 Million Credit Facility | Agreement To Purchase Ultramax And Capesize Vessels
Line of Credit Facility
Number of vessels committed to be acquired under purchase agreement | item				6
Revolver
Line of Credit Facility
Maximum borrowing capacity			$ 25,000,000
Drawdowns during the period		$ 24,000,000
Minimum amounts of borrowings			1,000
Consecutive quarterly commitment reductions			$ 1,900,000
Threshold percentage of ratio of outstanding loan to aggregate appraised value of collateral vessels.			60.00%
Repayment of secured debt	$ 21,160,000
Revolver | LIBOR
Line of Credit Facility
Applicable margin over reference rate for interest payable			3.00%

X

- Definition

The amount of consecutive quarterly commitment reduction at the end of the reporting period.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Threshold borrowing limit under the line of credit facility at the end of the of the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
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X

- Definition

Represents the number of vessels committed to be acquired by the entity under purchase agreement.

+ References

No definition available.

+ Details

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- Definition

Threshold percentage of ratio of outstanding loan to the aggregate appraised value of collateral vessels.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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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

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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