Represents the amount to be received in cash settle bankruptcy claim.

No definition available.

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

- 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:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents period of Payment plan.

+ References

No definition available.

+ Details

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

- 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

+ Details

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

- Definition

The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_OtherOperatingIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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=56944662&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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_GainContingenciesByNatureAxis=gnk_BankruptcySettlementDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=gnk_SamsunLogixCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gnk_SecuredTermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=gnk_BalticTradingCreditFacility2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=gnk_GencoPioneerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=gnk_GencoSugarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=gnk_GencoLeaderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
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SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands								1 Months Ended	3 Months Ended		9 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	Oct. 27, 2016	Oct. 26, 2016	Oct. 25, 2016	Oct. 21, 2016	Oct. 10, 2016	Oct. 08, 2016	Apr. 08, 2016	Nov. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Jul. 14, 2015	Dec. 31, 2014	Aug. 12, 2010
Subsequent Events
Other operating income									$ 0	$ 0	$ 182	$ 0
Bankruptcy settlement due \| Samsun
Subsequent Events
Other operating income											157
Cash to be received to settle bankruptcy claim							$ 1,035
Tenure of Payment plan							10 years
Secured Debt \| $100 Million Term Loan Facility
Subsequent Events
Maximum borrowing capacity									100,000	100,000	100,000	100,000				$ 100,000
Repayment of secured debt											5,769	5,769
Line of Credit Facility \| $148 Million Credit Facility
Subsequent Events
Maximum borrowing capacity									$ 148,000	$ 148,000	$ 148,000	$ 148,000	$ 148,000	$ 148,000	$ 148,000
Subsequent event \| Bankruptcy settlement due \| Samsun
Subsequent Events
Other operating income	$ 777
Subsequent event \| Genco Pioneer
Subsequent Events
Sale of assets						$ 2,650
Broker commission						5.50%
Subsequent event \| Genco Pioneer \| Line of Credit Facility \| $148 Million Credit Facility
Subsequent Events
Repayment of secured debt		$ 2,504
Subsequent event \| Genco Sugar
Subsequent Events
Sale of assets					$ 2,450
Broker commission					5.50%
Subsequent event \| Genco Sugar \| Secured Debt \| $100 Million Term Loan Facility
Subsequent Events
Repayment of secured debt				$ 2,315
Subsequent event \| Genco Leader
Subsequent Events
Sale of assets			$ 3,470
Broker commission			3.00%
Subsequent event \| Forecast \| Genco Leader \| Line of Credit Facility \| $148 Million Credit Facility
Subsequent Events
Repayment of secured debt								$ 3,366