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GENERAL INFORMATION (Details) (Subsequent Event, USD $) | 0 Months Ended |
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Apr. 07, 2015 | Apr. 07, 2015
Baltic Trading |  |
Business Acquisition [Line Items] |  |
Shares issued as purchase consideration | $ 0.216 us-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 | 2 gnk_NumberOfSinglePurposeEntities / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Number of vessels owned by each entity | 1 gnk_NumberOfCapesizeDrybulkVesselsOwnedByEachEntity / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Purchase price | 68,500,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
First-mortgage debt assumed | $ 40,563,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 40,563,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = gnk_SinglePurposeEntitiesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Represents the number of single purpose entities acquired. + References No definition available. + Details
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- Definition Represents the percentage of ownership by the entity's shareholders in the merged company. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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