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Amounts Contributed to Defined Contribution Plans in Various Jurisdictions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	$ 14,505	$ 12,199
India
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	4,303	3,909
U.S.
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	3,532	2,628
U.K.
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	1,652	1,040
China
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	3,753	3,516
Other regions
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plans, contributed amount	$ 1,265	$ 1,106

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- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

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+ References

No definition available.

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