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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Income from continuing operations	$ 8,394	$ 7,406
Weighted average common shares outstanding used in basic EPS	44,450	44,275
Effect of dilutive SOSARs, PSAs and RSUs	419	255
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,869	44,530
Earnings per share from continuing operations
Basic	$ 0.19	$ 0.17
Diluted	$ 0.19	$ 0.17