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Summary of Financial Information of Laser Quantum - Balance Sheet (Details) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Financial Statements Information [Line Items]        
Cash and cash equivalents $ 51,146us-gaap_CashAndCashEquivalentsAtCarryingValue $ 60,980us-gaap_CashAndCashEquivalentsAtCarryingValue $ 65,788us-gaap_CashAndCashEquivalentsAtCarryingValue $ 54,835us-gaap_CashAndCashEquivalentsAtCarryingValue
Laser Quantum        
Schedule Of Financial Statements Information [Line Items]        
Cash and cash equivalents $ 17,100us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gsig_LaserQuantumLtdMember
$ 13,600us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gsig_LaserQuantumLtdMember