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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (Baltic Trading Limited)	Mar. 31, 2015	Dec. 31, 2014
Baltic Trading Limited
Noncontrolling interest
Economic interest held by noncontrolling interest (as a percent)	89.15%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember	89.15%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember
Voting power (as a percent)	35.40%gnk_MinorityInterestVotingInterestHeldByNoncontrollingOwners / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember	35.40%gnk_MinorityInterestVotingInterestHeldByNoncontrollingOwners / dei_LegalEntityAxis = gnk_BalticTradingLimitedMember

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