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Condensed Consolidated Statements of Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	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	$ 100gnk_ProceedsFromIssuanceOfWarrantsInConnectionWithIssuanceOfNewEquityInterests
Issuance of common stock (in shares)	131,017us-gaap_StockIssuedDuringPeriodSharesNewIssues
Issuance of shares of nonvested stock	1,110,600us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Predecessor
Issuance of common stock (in shares)			7,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Issuance of shares of nonvested stock		200,634us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	464,175us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Issuance of shares of nonvested stock, forfeitures (in shares)		21,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	1,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X

- 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.

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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

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(iv)(3)



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Number of new stock issued during the period.

+ References

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-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 04



-Article 3







Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Topic 505



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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







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-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



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-Section 02



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