Income Taxes - Reconciliation of Effective Tax Rate on Income or Loss and Statutory Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory U.S. tax rate	21.00%	21.00%	35.00%
State income taxes, net of U.S. tax benefit	1.60%	1.80%	1.80%
Foreign income taxed at other than U.S. statutory rate	(5.00%)	1.10%	(0.60%)
Federal tax credits	(3.50%)	(4.40%)	(2.70%)
Other non-deductible expense	1.20%	0.70%	1.10%
Non-deductible compensation	1.50%	0.80%	0.70%
Stock option compensation excess tax benefits	(1.50%)	(1.00%)	(2.00%)
Intra-entity asset transfers	0.00%	0.80%	(6.30%)
Effective Income Tax Rate Reconciliation, Domestic Foreign Tax Inclusions, Percent	0.10%	1.10%	1.60%
Foreign derived intangible income deduction	(3.20%)	(2.70%)	0.00%
Effective Income Tax Rate Reconciliation, Impact Of Uncertain Tax Positions, Percent	3.70%	0.80%	1.80%
Enactment of the Tax Cuts and Jobs Act	0.00%	0.30%	11.10%
Change in deferred tax valuation allowance	0.20%	0.00%	(2.00%)
Other	1.20%	(0.50%)	(0.70%)
Effective tax rate	17.30%	19.80%	38.80%