Reconciliation of Earnings per Share and Shares in Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 128,959	$ 110,472	$ 87,240
Earnings per share:
Basic	$ 2.05	$ 1.74	$ 1.37
Effect of CESs	(0.02)	(0.02)	(0.01)
Diluted	$ 2.03	$ 1.72	$ 1.36
Weighted average number of shares:
Basic	62,768	63,445	63,538
Effect of CESs	640	878	795
Diluted	63,408	64,323	64,333