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Organization and Presentation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2013 Segment
Organization And Business Activities [Line Items] |
Minority interest ownership percentage | 50.00%
Number of reportable segments | 3
Minimum |
Organization And Business Activities [Line Items] |
Equity method investment ownership percentage | 20.00%
Maximum |
Organization And Business Activities [Line Items] |
Equity method investment ownership percentage | 50.00%

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

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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Period Type: | instant

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Period Type: | duration