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Operating Income (Loss) from Continuing Operations by Reportable Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 03, 2015
Mar. 28, 2014
Operating Income (Loss) from Continuing Operations    
Operating Income (Loss) from Continuing Operations $ 5,397us-gaap_OperatingIncomeLoss $ 4,068us-gaap_OperatingIncomeLoss
Laser Products    
Operating Income (Loss) from Continuing Operations    
Operating Income (Loss) from Continuing Operations 8,395us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_LaserProductsMember		 7,124us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_LaserProductsMember
Medical Technologies    
Operating Income (Loss) from Continuing Operations    
Operating Income (Loss) from Continuing Operations (654)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_MedicalTechnologiesMember		 (117)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_MedicalTechnologiesMember
Precision Motion    
Operating Income (Loss) from Continuing Operations    
Operating Income (Loss) from Continuing Operations 4,137us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_PrecisionMotionMember		 2,643us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= gsig_PrecisionMotionMember
Corporate, Shared Services and Unallocated    
Operating Income (Loss) from Continuing Operations    
Operating Income (Loss) from Continuing Operations $ (6,481)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ (5,582)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember