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, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Income (Loss)	$ 218,364	$ 176,568	$ 128,959
Earnings per share:
Basic	$ 3.56	$ 2.86	$ 2.05
Effect of CESs	(0.05)	(0.04)	(0.02)
Diluted	$ 3.51	$ 2.82	$ 2.03
Weighted average number of shares:
Basic	61,303	61,817	62,768
Effect of CESs	880	791	640
Diluted	62,183	62,608	63,408