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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory federal income tax rate, amount	$ 61,437	$ 47,975	$ 44,460
State income tax expense, net of federal income tax benefit	10,666	6,280	7,239
Audits and adjustments, net	2,131	662	2,556
Change in valuation allowances	1,317	476	(2,739)
Foreign income taxed at different rates	4,308	3,825	4,024
Research and development credits	(4,352)	(1,858)	(5,438)
Other, net	(2,295)	(1,548)	2,207
Income tax expense	$ 73,212	$ 55,812	$ 52,309
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	3.60%	2.70%	3.40%
Audits and adjustments, net, rate	0.70%	0.30%	1.20%
Change in valuation allowances, rate	0.50%	0.20%	(1300.00%)
Foreign income taxed at different rates, rate	1.50%	1.70%	1.90%
Research and development credits, rate	(1.50%)	(0.80%)	(2.60%)
Other, net, rate	(0.80%)	(0.70%)	1.10%
Effective tax rate	25.00%	24.40%	24.70%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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