Income Taxes - Reconciliation of Company's Effective Tax Rate to U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. federal income tax statutory rate	21.00%	21.00%	21.00%
Federal tax credits	(1.50%)	(2.90%)	(0.70%)
State income taxes, net of federal benefit	1.10%	2.30%	1.30%
Effect of foreign operations taxed at various rates	(5.00%)	(4.40%)	(1.30%)
Executive compensation	1.10%	5.80%
Gain on intercompany sale of assets		2.90%
Utilization of a capital loss		(1.20%)
Foreign derived intangible income	(1.50%)	(3.80%)	(2.10%)
Global intangible low taxed income, net of foreign tax credits	0.90%	2.60%	0.40%
Transition tax, net of foreign tax credits			(0.10%)
Revaluation of U.S. deferred income taxes		(1.40%)	(0.30%)
Revaluation of prepaid taxes			1.60%
Stock-based compensation	(0.70%)	(0.30%)	(1.30%)
Deferred tax asset valuation allowance	0.60%	0.10%
Release of income tax reserves (including interest)		(0.80%)	(0.40%)
Taxes on foreign dividends, net of foreign tax credits	0.70%	0.60%	(1.00%)
Other	0.50%	0.60%	1.20%
Total	17.20%	21.10%	18.30%