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Condensed Consolidated Statements of Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Issuance of new equity interests in connection with emergence from Chapter 11 in connection with the Rights Offering | $ 100 gnk_ProceedsFromIssuanceOfWarrantsInConnectionWithIssuanceOfNewEquityInterests |  |
Issuance of common stock (in shares) | 131,017 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |
Issuance of shares of nonvested stock | 1,110,600 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation |  |
Predecessor |  |  |
Issuance of common stock (in shares) |  |  | 7,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Issuance of shares of nonvested stock |  | 200,634 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 464,175 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Issuance of shares of nonvested stock, forfeitures (in shares) |  | 21,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 1,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition The cash inflow from issuance of rights in connection with Issuance of new equity interests in connection with emergence from Chapter 11. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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