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Components of Income Tax Provision (Benefit) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 26, 2014
Jun. 27, 2014
Mar. 28, 2014
Dec. 31, 2013
Sep. 27, 2013
Jun. 28, 2013
Mar. 29, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]                      
Current income tax provision (benefit)                 $ 5,730us-gaap_CurrentIncomeTaxExpenseBenefit $ 2,314us-gaap_CurrentIncomeTaxExpenseBenefit $ 5,835us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax provision (benefit)                 (6,736)us-gaap_DeferredIncomeTaxExpenseBenefit 3,886us-gaap_DeferredIncomeTaxExpenseBenefit (17,430)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Provision (benefit) (6,013)us-gaap_IncomeTaxExpenseBenefit 2,013us-gaap_IncomeTaxExpenseBenefit 2,057us-gaap_IncomeTaxExpenseBenefit 937us-gaap_IncomeTaxExpenseBenefit 1,246us-gaap_IncomeTaxExpenseBenefit 1,533us-gaap_IncomeTaxExpenseBenefit 3,018us-gaap_IncomeTaxExpenseBenefit 403us-gaap_IncomeTaxExpenseBenefit (1,006)us-gaap_IncomeTaxExpenseBenefit 6,200us-gaap_IncomeTaxExpenseBenefit (11,595)us-gaap_IncomeTaxExpenseBenefit
CANADA                      
Components Of Income Tax Expense Benefit [Line Items]                      
Current income tax provision (benefit)                 175us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
0us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
0us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
Deferred income tax provision (benefit)                 0us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
0us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
0us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_CA
UNITED STATES                      
Components Of Income Tax Expense Benefit [Line Items]                      
Current income tax provision (benefit)                 3,615us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
1,662us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
3,560us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
Deferred income tax provision (benefit)                 (6,731)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
2,206us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
(14,467)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_US
Other Countries                      
Components Of Income Tax Expense Benefit [Line Items]                      
Current income tax provision (benefit)                 1,940us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember
652us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember
2,275us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember
Deferred income tax provision (benefit)                 $ (5)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember
$ 1,680us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember
$ (2,963)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= gsig_OtherCountriesMember