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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Foreign income inclusions	1.00%	1.80%	5.50%
Foreign tax rate differential	(16.60%)	(9.60%)	(14.60%)
Tax (credit)/charge from previous years	(0.70%)	(0.50%)	4.70%
Net (credit) from unrecognized tax benefits	(1.60%)	(1.50%)	(6.20%)
Foreign currency transactions	2.40%	(1.90%)	1.00%
United Kingdom income tax rate reduction	(0.60%)	(0.70%)	(0.00%)
Other items and adjustments, net	2.20%	(1.10%)	(1.20%)
Effective Income Tax Rate	21.10%	21.50%	24.20%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax charges (credits)

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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