XML 35 R81.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Restricted Stock Units Issued and Outstanding (Parenthetical) (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Common stock fair value per share | $ 11.24
Restricted stock unit purchase price | $ 0

X
- Definition Common Stock Fair Value Per Share + References No definition available. + Details
Name: | gsig_CommonStockFairValuePerShare
Namespace Prefix: | gsig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restricted Stock Price Per Share + References No definition available. + Details
Name: | gsig_RestrictedStockPricePerShare
Namespace Prefix: | gsig_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration