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Organization and Presentation - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2008
Jun. 30, 2009
Organization And Business Activities [Line Items]      
Minority interest ownership percentage 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent    
Compliance description The delay in the quarterly report on Form 10-Q caused a noncompliance with a covenant in the indenture governing the $210.0 million of 11% unsecured senior notes due 2013 (the “2008 Senior Notes”).    
Date of petition for bankruptcy filed with the bankruptcy court Nov. 20, 2009    
11% Senior Unsecured Notes Due 2013      
Organization And Business Activities [Line Items]      
Senior notes covenant amount   $ 210.0gsig_DebtInstrumentCovenantBorrowingAggregatePrincipalAmount
/ us-gaap_DebtInstrumentAxis
= gsig_SeniorUnsecuredNotesElevenPercentDueTwentyThirteenMember
 
Debt instrument interest rate   11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= gsig_SeniorUnsecuredNotesElevenPercentDueTwentyThirteenMember
 
Minimum      
Organization And Business Activities [Line Items]      
Equity method investment ownership percentage 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Percentage of principal amount     75.00%gsig_DebtInstrumentPercentOfPrincipalAmount
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum      
Organization And Business Activities [Line Items]      
Equity method investment ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember