XML 95 R91.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Summary of Performance Units Activity (Parenthetical) (Detail) (Performance Units) | Sep. 30, 2013
--- | ---
Performance Units |
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items] |
Percentage change on achievement of performance goals | 22.20%
Percentage Change on achievement of performance goals | 27.80%

X
- Details
Name: | g_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceShareUnitsLineItems
Namespace Prefix: | g_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the percentage of achieved performance, higher than target performance of Share Based Payment Award other than options. + References No definition available. + Details
Name: | g_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsPercentageHigherThanTargetPerformance
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition It represents the percentage of achieved performance, lower than maximum performance of Share Based Payment Award other than options. + References No definition available. + Details
Name: | g_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsPercentageLowerThanMaximumPerformance
Namespace Prefix: | g_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant