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Summary of Significant Accounting Policies - Additional Information (Detail) (General Electric Company)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
General Electric Company
Schedule Of Significant Accounting Policies [Line Items]
Percentage of accounts receivables	27.00%		27.00%		30.00%
Percentage of revenues	22.00%	26.00%	23.00%	26.00%

X

- Definition

Net revenue from one of the clients as a percentage of total net revenues of the Company for the reporting period.

+ References

No definition available.

+ Details

Name:	g_PercentageContributionOfSpecificClientInTotalRevenue
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net amount due from one of the clients of the Company as a percentage of the total net amount due from all the clients for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

+ References

No definition available.

+ Details

Name:	g_PercentageOfAccountsReceivables
Namespace Prefix:	g_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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