Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) from Continuing Operations (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]
Income (loss) from continuing operations	$ 1,492	$ (2,281)	$ 9,886	$ 5,125
Weighted average common shares outstanding used in basic EPS	44,563	44,343	44,507	44,309
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs	309		358	232
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,872	44,343	44,865	44,541
Earnings (loss) per share from continuing operations
Basic	$ 0.03	$ (0.05)	$ 0.22	$ 0.12
Diluted	$ 0.03	$ (0.05)	$ 0.22	$ 0.12