Income Taxes - Reconciliation Between U.S. Federal Income Tax Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal income tax rate	21.00%	21.00%	21.00%
State income taxes—U.S.	2.00%	2.90%	1.30%
Nondeductible compensation	3.40%	1.90%	1.00%
Foreign exchange on entity closures	0.00%	1.80%	0.00%
Valuation allowances	0.80%	0.40%	0.50%
Taxes on non-U.S. income - U.S., Canadian & European reorganization	0.70%	0.30%	1.10%
U.S. tax reform	0.00%	0.00%	1.60%
Manufacturing deduction credit	0.00%	0.00%	(1.00%)
Employee share-based payments	3.90%	2.60%	1.60%
Research and development credit	(1.20%)	(0.60%)	(0.90%)
Taxes on non-U.S. income	2.60%	(0.50%)	0.40%
Other	0.30%	0.50%	(0.50%)
Effective income tax rate	25.70%	25.10%	22.90%