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GOODWILL IMPAIRMENT (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 segment item | Jul. 09, 2014
Goodwill |  |  |
Number of operating segments |  | 2 us-gaap_NumberOfOperatingSegments |
Number of Reporting Units |  | 2 us-gaap_NumberOfReportingUnits |
Period of industry average charter rates for each vessel class |  | 10 years |
Goodwill, Impairment Loss | $ 166,067 us-gaap_GoodwillImpairmentLoss |  |
Percentage of fair value assets used method |  | 75.00%gnk_PercentageToMethodOfFairValueAssetsForDeterminingFairValue |
Percentage of public trading price method |  | 25.00%gnk_PercentageToMethodOfPublicTradingPriceForDeterminingFairValue |
Percentage of discounted cash flow method |  | 0.00%gnk_PercentageToMethodOfDiscountedCashFlowsForDeterminingFairValue |
Predecessor |  |  |
Goodwill |  |  |
Goodwill |  |  | $ 166,067 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X
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- Definition Percentage considered to method of discounted cash flows that were used for calculating the fair value of each reporting unit. + References No definition available. + Details
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- Definition Percentage considered to method of fair value of assets that were used for calculating the fair value of each reporting unit. + References No definition available. + Details
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- Definition Percentage considered to method of public trading price that were used for calculating the fair value of each reporting unit. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reporting Unit -URI http://asc.fasb.org/extlink&oid=6523643 + Details
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