Reconciliation of Statutory U.S. Federal Rate and Tax Effective Rates (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income tax, net of federal benefit	3.60%	3.90%	3.50%
State credit carryforwards	(0.80%)	0.50%	1.30%
U.S. federal R&D tax credit	(1.80%)	(1.90%)	(1.90%)
Excess benefit of equity compensation	(4.90%)	(3.40%)	(0.10%)
Employee compensation limitation	3.40%	2.70%	2.10%
Global Intangible Low Taxed Income (GILTI)	0.20%	0.10%
Foreign-derived intangible income (FDII) deduction	(3.10%)	(2.70%)	(3.10%)
Foreign operations	(0.70%)	1.00%	1.10%
Tax contingencies	(0.30%)	1.90%	3.70%
Other permanent differences	0.30%	(0.20%)	(0.60%)
Change in valuation allowance	0.70%	0.40%	(0.90%)
Income taxes	17.60%	23.30%	26.10%