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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Foreign income inclusions	1.80%	5.50%	4.20%
Foreign tax rate differential	(9.60%)	(14.60%)	(14.60%)
Tax charge/(credit) from previous years	(0.50%)	4.70%	(2.90%)
Net charge/(credit) from unrecognized tax benefits	(1.50%)	(6.20%)	0.20%
Foreign currency translation	(1.90%)	1.00%	(2.70%)
Other items and adjustments, net	(1.10%)	(1.20%)	(3.90%)
United Kingdom income tax rate reduction	(0.70%)	0.00%	0.90%
Effective Income Tax Rate	21.50%	24.20%	16.20%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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