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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Vessels, net
Estimated useful life	25 years
Depreciation expense	$ 32,739	$ 33,091
Estimated scrap value (in dollars per lightweight ton)	245.00
Deferred revenue
Accrual related to estimated customer claims	318		407
Voyage expense recognition
Net gain on purchase and sale of bunker fuel	$ 364	$ 720
Baltic Trading Limited
Noncontrolling interest
Economic interest held by noncontrolling interest (as a percent)	75.22%		75.22%
Voting power (as a percent)	16.83%		16.83%

X

- Definition

Represents the accrual related to estimated customer claims.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the depreciation of vessels.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the voting interest held by noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

Name:	gnk_MinorityInterestVotingInterestHeldByNoncontrollingOwners
Namespace Prefix:	gnk_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Details

Name:	gnk_VesselsAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Represents the estimated scrap value of vessels.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnk_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the estimated useful life of vessels.

+ References

No definition available.

+ Details

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

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- Details

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- Details

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- Details

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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