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Summary of Restricted Share Units Granted (Parenthetical) (Detail) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Jan. 31, 2016
Restricted Share Units (RSUs)
Schedule Of Activity Related To Restricted Shares And Restricted Share [Line Items]
RSUs settled on vesting by issuing shares (net of minimum tax withholding)	3,228	91,963

X

- Definition

Schedule Of Activity Related To Restricted Shares And Restricted Share [Line Items]

+ References

No definition available.

+ Details

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

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- Definition

The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: