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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory rate	35.00%	35.00%	35.00%
Foreign income inclusions	2.10%	1.00%	1.80%
Foreign tax rate differential	(13.70%)	(16.60%)	(9.60%)
Tax charge/(credit) from previous years	1.10%	(0.70%)	(0.50%)
Net credit from unrecognized tax benefits	(0.40%)	(1.60%)	(1.50%)
Foreign currency transactions	(0.90%)	2.40%	(1.90%)
United Kingdom income tax rate reduction	(0.00%)	(0.60%)	(0.70%)
Effect of U.S, tax law change	31.70%	0.00%	0.00%
Other items and adjustments, net	(3.10%)	2.20%	(1.10%)
Effective Income Tax Rate	51.80%	21.10%	21.50%

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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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