Earnings per Share - Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 78,120,000	$ 91,801,000	$ 46,916,000
Net income allocated to unvested restricted stock awards	0	(26,000)	(69,000)
Net income allocated to common shares	$ 78,120,000	$ 91,775,000	$ 46,847,000
Weighted average shares outstanding	29,393	29,403	29,244
Average unvested restricted stock awards	0	(8)	(46)
Denominator for basic earnings per share—weighted-average shares outstanding	29,393	29,395	29,198
Effect of dilutive securities—employee stock options and restricted stock units	158	159	70
Denominator for diluted earnings per share—adjusted weighted-average shares outstanding	29,551	29,554	29,268
Basic earnings per share	$ 2.66	$ 3.12	$ 1.60
Diluted earnings per share	$ 2.64	$ 3.11	$ 1.60
Average anti-dilutive options and restricted stock units excluded from computation of diluted earnings per share	245	277	491