Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net earnings	$ 18,749	$ 17,927
Less earnings attributable to RSUs outstanding	(458)	(395)
Net earnings attributable to common stockholders used in basic and diluted earnings per share calculation	$ 18,291	$ 17,532
Basic	46,721	43,872
Incremental shares from stock-based compensation	21	3
Diluted	46,742	43,875
Basic earnings per common share	$ 0.39	$ 0.40
Diluted earnings per common share	$ 0.39	$ 0.40