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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

X

- Definition

The aggregate expense charged against earnings to allocate the cost of acquired intangible assets.

+ References

No definition available.

+ Details

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X

- 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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Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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