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GENERAL INFORMATION (Details) (Subsequent Event, USD $)	0 Months Ended
	Apr. 07, 2015	Apr. 07, 2015
Baltic Trading
Business Acquisition [Line Items]
Shares issued as purchase consideration	$ 0.216us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = gnk_BalticTradingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Ownership interest upon merger completion (as a percent)	84.50%gnk_PercentageOfOwnershipInMergedCompany / us-gaap_BusinessAcquisitionAxis = gnk_BalticTradingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	84.50%gnk_PercentageOfOwnershipInMergedCompany / us-gaap_BusinessAcquisitionAxis = gnk_BalticTradingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Minority share holding in merged company	15.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = gnk_BalticTradingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	15.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = gnk_BalticTradingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Single Purpose Entities
Business Acquisition [Line Items]
Number of single purpose entities	2gnk_NumberOfSinglePurposeEntities / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Number of vessels owned by each entity	1gnk_NumberOfCapesizeDrybulkVesselsOwnedByEachEntity / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase price	68,500,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
First-mortgage debt assumed	$ 40,563,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember	40,563,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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

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