Segment Information - Additional Information (Detail)	6 Months Ended
Jun. 27, 2014 Segment
Segment Reporting Information [Line Items]
Number of previously operated segments	3

Number of operating segments previously reported in prior year audited financial statements.

No definition available.

Name:	gsig_NumberOfPreviousOperatingSegments
Namespace Prefix:	gsig_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration