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Depreciation and Amortization by Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Depreciation and Amortization      
Depreciation and Amortization $ 24,421gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation $ 19,950gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation $ 12,683gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
Laser Products      
Depreciation and Amortization      
Depreciation and Amortization 6,481gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_LaserProductsMember		 6,335gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_LaserProductsMember		 6,448gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_LaserProductsMember
Medical Technologies      
Depreciation and Amortization      
Depreciation and Amortization 13,254gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_MedicalTechnologiesMember		 8,808gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_MedicalTechnologiesMember		 702gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_MedicalTechnologiesMember
Precision Motion      
Depreciation and Amortization      
Depreciation and Amortization 1,943gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_PrecisionMotionMember		 1,979gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_PrecisionMotionMember		 2,066gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_PrecisionMotionMember
Corporate, Shared Services and Unallocated      
Depreciation and Amortization      
Depreciation and Amortization $ 2,743gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 2,828gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 3,467gsig_DepreciationAndAmortizationIncludingRestructuringReserveAcceleratedDepreciation
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember