Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 19,795	$ 19,805
Less: earnings allocated to participating securities	187	196
Net income allocated to common shareholders	$ 19,608	$ 19,609
Weighted average number of common shares outstanding - basic (in shares)	65,135	64,966
Share-based plans (in shares)	189	262
Weighted average number of common shares outstanding - diluted (in shares)	65,324	65,228
Basic earnings per share (in usd per share)	$ 0.30	$ 0.30
Diluted earnings per share (in usd per share)	$ 0.30	$ 0.30