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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
Maximum
Leases Future Minimum Payments [Line Items]
Capital lease payments interest included in payment	$ 0.1

X

- Details

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

X

- 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