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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Income from continuing operations	$ 6,527	$ 8,643	$ 11,652	$ 19,539
Weighted average common shares outstanding used in basic EPS	44,368	44,171	44,329	44,113
Effect of dilutive SOSARs, PSAs and RSUs	268	271	220	292
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,636	44,442	44,549	44,405
Earnings per share from continuing operations
Basic	$ 0.15	$ 0.19	$ 0.26	$ 0.44
Diluted	$ 0.15	$ 0.19	$ 0.26	$ 0.44