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Other Operating Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components of Other Operating Income [Line Items]
Other operating (income) expense	$ (498)	$ (462)
Provision for impairment of intangible assets	4,943
Change in fair value of earn out consideration and deferred consideration (relating to business acquisitions)	(9,506)
Other operating (income) expense, net	$ (5,061)	$ (462)

X

- Definition

This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent/deferred consideration, assumed in a business combination.

+ References

No definition available.

+ Details

Name:	g_BusinessCombinationContingentAndDeferredConsiderationArrangementsChangeInAmountOfContingentAndDeferredConsiderationLiability
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Components of Other Operating Income [Line Items]

+ References

No definition available.

+ Details

Name:	g_ComponentsOfOtherOperatingIncomeLineItems
Namespace Prefix:	g_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of other operating income (expenses), not previously categorized, from items that are associated with the entity's operation.

+ References

No definition available.

+ Details

Name:	g_OtherOperatingIncomeExpense
Namespace Prefix:	g_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

+ Details

Name:	us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration