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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

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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

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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

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