Earnings Per Share - Details of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Income from continuing operations	$ 8,059	$ 6,527	$ 17,945	$ 11,652
Weighted average common shares outstanding used in basic EPS (in shares)	44,593	44,368	44,536	44,329
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs (in shares)	346	268	353	220
Weighted average common shares outstanding and common share equivalents used in diluted EPS (in shares)	44,939	44,636	44,889	44,549
Earnings per share from continuing operations
Basic (in dollars per share)	$ 0.18	$ 0.15	$ 0.40	$ 0.26
Diluted (in dollars per share)	$ 0.18	$ 0.15	$ 0.40	$ 0.26