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Other Operating Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of Other Operating Income [Line Items]
Other operating (income) expense	$ (1,051)	$ (789)	$ (2,260)	$ (2,302)
Provision for impairment of capital work in progress / property, plant and equipment		2,121	2,392	2,121
Change in fair value of earn out consideration and deferred consideration (relating to business acquisitions)	(2,181)	(1,930)	(4,452)	(1,930)
Other operating (income) expense, net	$ (3,232)	$ (598)	$ (4,320)	$ (2,111)

X

- Definition

This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent/deferred consideration, assumed in a business combination.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Amount of other operating income (expenses), not previously categorized, from items that are associated with the entity's operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	g_
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X

- Definition

The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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X

- Definition

The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

+ References

No definition available.

+ Details

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