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Income Taxes - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]        
Tax benefit recognized due to the release of a portion of the valuation allowance on deferred tax assets     $ 15,300,000gsig_TaxBenefitFromReleaseOfValuationAllowance  
Loss carryforwards 4,500,000us-gaap_OperatingLossCarryforwards      
Tax credits 4,200,000gsig_DeferredTaxAssetCreditCarryforward      
Undistributed earnings of foreign subsidiaries 15,800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Estimated unrecognized deferred income tax liabilities related to undistributed earnings of foreign subsidiaries 1,100,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
Unrecognized tax benefits 6,274,000us-gaap_UnrecognizedTaxBenefits 7,074,000us-gaap_UnrecognizedTaxBenefits 7,554,000us-gaap_UnrecognizedTaxBenefits 7,284,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that will impact tax rate if recognized 4,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 4,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 4,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Settlements with taxation authorities     3,035,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Maximum unrecognized tax benefits expected to be recorded in next twelve months 700,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound      
Unrecognized tax benefit income tax interest and penalties accrued 600,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Unrecognized tax benefits, income tax penalties and interest expense 300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense      
Unrecognized tax benefits, decrease in income tax penalties and interest expense   300,000gsig_UnrecognizedTaxBenefitsDecreasesInIncomeTaxPenaltiesAndInterestExpense    
Capital Loss Carryforward        
Income Taxes [Line Items]        
Released valuation allowance previously recorded on certain U.S. state tax credits 400,000us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		      
CANADA        
Income Taxes [Line Items]        
Adjusted loss carryforward and related valuation allowance   4,800,000gsig_NetOperatingLossCarryforwardsUtilized
/ us-gaap_StatementGeographicalAxis
= country_CA		    
Loss carryforwards 2,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_CA		      
Operating loss carryforwards expiration year 2015      
Tax credits 2,100,000gsig_DeferredTaxAssetCreditCarryforward
/ us-gaap_StatementGeographicalAxis
= country_CA		      
CANADA | Expires through 2022        
Income Taxes [Line Items]        
Tax credits 800,000gsig_DeferredTaxAssetCreditCarryforward
/ us-gaap_StatementGeographicalAxis
= country_CA
/ us-gaap_TaxPeriodAxis
= gsig_PeriodThreeMember		      
Tax credits, expiration Year 2021      
CANADA | Carried forward indefinitely        
Income Taxes [Line Items]        
Tax credits 1,300,000gsig_DeferredTaxAssetCreditCarryforward
/ us-gaap_StatementGeographicalAxis
= country_CA
/ us-gaap_TaxPeriodAxis
= gsig_PeriodFourMember		      
UNITED STATES        
Income Taxes [Line Items]        
Loss carryforwards 1,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_US		      
Operating loss carryforwards expiration year 2033      
Tax credits 2,100,000gsig_DeferredTaxAssetCreditCarryforward
/ us-gaap_StatementGeographicalAxis
= country_US		      
Tax credits, expiration Year 2034      
UNITED KINGDOM        
Income Taxes [Line Items]        
Loss carryforwards 800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= country_GB		      
State and Local Jurisdiction        
Income Taxes [Line Items]        
Valuation allowances against current year net operating losses in certain tax jurisdictions 300,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 1,300,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Released valuation allowance previously recorded on certain U.S. state tax credits 300,000us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 300,000us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Foreign Tax Authority        
Income Taxes [Line Items]        
Adjusted loss carryforward and related valuation allowance   $ 700,000gsig_NetOperatingLossCarryforwardsUtilized
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember