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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	35.00%
Foreign income inclusions	0.30%	0.70%	2.10%
Foreign tax rate differential	(0.20%)	(0.50%)	(13.70%)
Tax charge/(credit) from previous years	1.80%	0.70%	1.10%
Net charge/(credit) from unrecognized tax benefits	1.10%	0.30%	(0.40%)
Foreign currency transactions	(0.30%)	1.40%	(0.90%)
Effect of U.S. tax law change	0.60%	9.30%	31.70%
Tax on unremitted earnings	(0.10%)	0.90%	0.00%
Non-deductible foreign interest	0.80%	1.30%	1.10%
Other items and adjustments, net	0.40%	0.30%	(4.20%)
Effective Income Tax Rate	25.40%	35.40%	51.80%

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