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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	35.00%	35.00%
Foreign income inclusions	0.70%	2.10%	1.00%
Foreign tax rate differential	(0.50%)	(13.70%)	(16.60%)
Tax charge/(credit) from previous years	0.70%	1.10%	(0.70%)
Net charge/(credit) from unrecognized tax benefits	0.30%	(0.40%)	(1.60%)
Foreign currency transactions	1.40%	(0.90%)	2.40%
United Kingdom income tax rate reduction	(0.00%)	(0.00%)	(0.60%)
Effect of U.S. tax law change	9.30%	31.70%	0.00%
Tax on unremitted earnings	90.00%	0.00%	0.00%
Non-deductible foreign interest	130.00%	110.00%	0.00%
Other items and adjustments, net	0.30%	(4.20%)	2.20%
Effective Income Tax Rate	35.40%	51.80%	21.10%

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