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Income Tax Returns to be Reviewed (Detail) | 12 Months Ended
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Dec. 31, 2013
UNITED STATES |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2009 - Present
CANADA |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2006 - Present
UNITED KINGDOM |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2009 - Present
CHINA |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2010 - Present
JAPAN |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2008 - Present
GERMANY |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2008 - Present
NETHERLANDS |
Income Tax Examination [Line Items] |
Income tax returns to be reviewed | 2009 - Present

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- Definition The years open for review of income tax returns under the appropriate statute of limitations + References No definition available. + Details
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Namespace Prefix: | gsig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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