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Future Minimum Lease Payments under Operating and Capital Leases (Parenthetical) (Detail) (Maximum, USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Maximum |
Leases Future Minimum Payments [Line Items] |
Capital lease payments interest included in payment | $ 0.1

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- Details
Name: | gsig_LeasesFutureMinimumPaymentsLineItems
Namespace Prefix: | gsig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount necessary to reduce net minimum lease payments to present value for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
Name: | us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant