Income Taxes - Schedule Reconciles Difference between U.S. Federal Income Taxes at U.S. Statutory Rate and Our Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal income tax rate, amount	$ 79,349	$ 78,631	$ 61,437
State income tax expense, net of federal income tax benefit	12,113	13,962	10,666
Audits and adjustments, net	(925)	2,273	2,131
Change in valuation allowances	1,616	(2,551)	1,317
Foreign income taxed at different rates	6,133	5,660	4,308
Research and other credits	(3,036)	(3,870)	(4,352)
Other, net	1,295	(280)	(2,295)
Income tax expense	$ 96,545	$ 93,825	$ 73,212
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income tax expense, net of federal income tax benefit, rate	3.20%	3.70%	3.60%
Audits and adjustments, net, rate	(0.20%)	0.60%	0.70%
Change in valuation allowances, rate	0.40%	(0.70%)	0.50%
Foreign income taxed at different rates, rate	1.60%	1.50%	1.50%
Research and development credits, rate	(0.80%)	(1.00%)	(1.50%)
Other, net, rate	0.40%	0.00%	(0.80%)
Effective tax rate	25.60%	25.10%	25.00%