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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net earnings	$ 12,890	$ 10,973	$ 30,817	$ 23,673
Less earnings attributable to RSUs outstanding	(359)	(318)	(718)	(635)
Net earnings attributable to common stockholders used in basic and diluted earnings per share calculation	$ 12,531	$ 10,655	$ 30,099	$ 23,038
Basic	44,437	41,456	44,156	41,420
Incremental shares from stock-based compensation	33	11	20	25
Diluted	44,470	41,467	44,176	41,445
Basic earnings per common share	$ 0.28	$ 0.26	$ 0.68	$ 0.56
Diluted earnings per common share	$ 0.28	$ 0.26	$ 0.68	$ 0.56

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