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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill deductible for tax purposes | $ 39,260 |  | $ 39,260 |  | $ 6,779
Amortization of acquired intangible assets | 5,867 | 6,014 | 17,603 | 17,094 |
Amortization of intangible assets recognized for minimum volume commitment from a client at the time of 2004 Reorganization | $ 0 | $ 17 | $ 0 | $ 55 |

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- Definition The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Represents the current period amortization expense, reduced from revenues, on intangible asset (representing minimum volume commitment from a client) created at the time of reorganization. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: | g_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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