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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%
Foreign income inclusions	7.10%	0.30%	0.70%
Foreign tax rate differential	4.20%	(0.30%)	(0.80%)
Tax charge/(credit) from previous years	3.70%	1.80%	0.70%
Net charge/(credit) from unrecognized tax benefits	(1.70%)	1.10%	0.30%
Foreign currency transactions	(4.50%)	(1.00%)	1.20%
Effect of U.S. tax law change	0.00%	0.60%	9.30%
Tax on unremitted earnings	0.30%	(0.10%)	0.90%
Non-deductible foreign interest	0.70%	0.80%	1.30%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	6.90%	0.00%	0.00%
State and local taxes	1.50%	1.40%	1.20%
US incentive for foreign derived intangible income	(1.50%)	(0.50%)	(1.00%)
Innovation incentives – current year	(4.90%)	(0.60%)	(0.60%)
Innovation incentives – prior years	(5.30%)	0.00%	0.00%
Non-deductible officer compensation	1.80%	0.20%	0.40%
Other items and adjustments, net	(1.60%)	0.70%	0.80%
Effective Income Tax Rate	27.70%	25.40%	35.40%

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