Income Taxes - Schedule of Principal Reasons for Difference Between Effective Income Tax Rate and Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
US federal statutory income tax rate		$ 45,536	$ 42,302	$ 40,345
Tax Credits		(368)	(695)	(573)
Nontaxable and nondeductible items		2,396	3,394	1,180
Nondeductible compensation		2,162	2,584	2,180
Other		234	810	(1,000)
Changes in valuation allowances		31	0	0
Other		(1,433)	(233)	(315)
Domestic state and local income taxes, net of federal effect	[1]	7,993	6,074	4,930
Foreign tax effects		4	18	13
Changes in unrecognized tax benefits		2,763	2,990	(1,111)
Total provision for income taxes		$ 56,922	$ 53,850	$ 44,469
Percent
US federal statutory income tax rate		21.00%	21.00%	21.00%
Tax credits		(0.20%)	(0.30%)	(0.30%)
Nontaxable and nondeductible items		1.10%	1.70%	0.60%
Nondeductible compensation		1.00%	1.30%	1.10%
Other		0.10%	0.40%	(0.50%)
Changes in valuation allowances		0.00%	0.00%	0.00%
Other		(0.60%)	(0.20%)	(0.20%)
Domestic state and local income taxes, net of federal effect	[1]	3.70%	3.00%	2.60%
Foreign tax effects		0.00%	0.00%	0.00%
Changes in unrecognized tax benefits		1.30%	1.50%	(0.60%)
Total		26.30%	26.70%	23.10%

[1] The states that contribute to the majority (greater than 50%) of the tax effect in this category include California, Florida and Illinois for 2025, Illinois for 2024 and Illinois for 2023.