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SUBSEQUENT EVENTS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Jan. 07, 2015	Dec. 31, 2014	Dec. 30, 2014	Jan. 02, 2015	Feb. 27, 2015	Oct. 08, 2014
Subsequent Event
Remaining payment to acquire vessel	$ 24,473gnk_PaymentsToAcquireVesselsAndOtherDeposits
Baltic Trading 2014 Term Loan Facilities | Baltic Wasp
Subsequent Event
Maximum borrowing capacity							16,800us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Baltic Trading $148 Million Credit Facility
Subsequent Event
Drawdowns during the period		104,500us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember	0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember
Maximum borrowing capacity	148,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember		148,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember
Baltic Trading $115 Million Revolving Credit Facility
Subsequent Event
Maximum borrowing capacity	115,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member		115,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = gnk_RevolvingCreditFacility2014Member
Baltic Trading Limited | Baltic Trading 2014 Term Loan Facilities | Baltic Wasp
Subsequent Event
Drawdowns during the period				16,350us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityThreeMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Subsequent Event | Baltic Trading Limited | Baltic Wasp
Subsequent Event
Capacity of Vessels in Deadweight Tonnage					63,389gnk_CapacityOfVesselsInDeadweightTonnage / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Remaining payment to acquire vessel					19,400gnk_PaymentsToAcquireVesselsAndOtherDeposits / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / gnk_VesselsByNameAxis = gnk_BalticWaspMember
Subsequent Event | Baltic Trading Limited | Baltic Trading $148 Million Credit Facility
Subsequent Event
Drawdowns during the period						$ 10,500us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = gnk_TermLoanFacilityFourMember / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Represents the capacity of vessels expressed in deadweight tonnage (dwt), a measure of weight a ship is carrying or can safely carry.

+ References

No definition available.

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- Definition

The cash outflow associated with acquisition of vessels, including deposits.

+ References

No definition available.

+ Details

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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://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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

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