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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (Baltic Trading Limited)	Jun. 30, 2014	Dec. 31, 2013
Baltic Trading Limited
Noncontrolling interest
Economic interest held by noncontrolling interest (as a percent)	88.96%	88.95%
Voting power (as a percent)	34.94%	34.92%

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
Period Type:	instant

X

- Details

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant