v2.3.0.15

Summary Of Significant Accounting Policies (Narrative) (Details) (General Electric Company [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
General Electric Company [Member]
Percentage of accounts receivables	35.00%		35.00%		43.00%
Percentage of revenues	29.00%	38.00%	31.00%	39.00%

X

- Definition

Net amount due from one of the related party 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.

+ Details

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

X

- Definition

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

+ Details

Name:	g_RelatedPartyTransactionRevenuePercentageOfTotalRevenue
Namespace Prefix:	g
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration