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Expected Future Benefit Payments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
UNITED KINGDOM  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2015 $ 827us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
2016 974us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
2017 1,092us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
2018 900us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
2019 1,290us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
2020-2024 8,097us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
Total 13,180gsig_DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_GB
JAPAN  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2015 514us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_JP
2016 76us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_JP
2017 76us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_JP
2018 75us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_JP
Total $ 741gsig_DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= country_JP