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DEBT - $253M and $100M Term Loans (Details) $ in Thousands				3 Months Ended	9 Months Ended
	Mar. 29, 2016 USD ($)	Mar. 11, 2016 USD ($)	Aug. 12, 2010 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 20, 2010 USD ($) item
$100 Million Term Loan Facility
Line of Credit Facility
Profile for Amortization Period			13 years
Secured Debt | $253 Million Term Loan Facility
Line of Credit Facility
Maximum borrowing capacity				$ 253,000	$ 253,000			$ 253,000
Number of vessels delivered pursuant to the agreement | item								13
Prepayment of the outstanding indebtedness		$ 5,075
Repayments of Secured Debt				5,075	$ 15,225
Long-term Debt						$ 0	$ 0
Secured Debt | $253 Million Term Loan Facility | LIBOR
Line of Credit Facility
Reference rate					LIBOR
Applicable margin over reference rate (as a percent)					3.50%
Secured Debt | $100 Million Term Loan Facility
Line of Credit Facility
Maximum borrowing capacity			$ 100,000	100,000	$ 100,000
Number of vessels acquired | item			5
Prepayment of amortization payment before due date	$ 1,923
Repayments of Secured Debt				$ 1,923	$ 5,769
Long-term Debt						$ 0	$ 0
Secured Debt | $100 Million Term Loan Facility | LIBOR
Line of Credit Facility
Reference rate					LIBOR
Applicable margin over reference rate (as a percent)					3.50%

X

- Definition

The number of years the profile is based on for which the outstanding principle of this loan is amortized.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ 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 vessels under option to purchase pursuant to the purchase agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of cash outflow for prepayment of amortization payment before due date.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of payment made towards outstanding debt during the period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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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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X

- 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://www.xbrl.org/2003/role/presentationRef
-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=6877327&loc=d3e13212-122682

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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Details

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- Details

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- Details

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- Details

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