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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ 8,643	$ (705)	$ 19,539	$ 2,841
Weighted average common shares outstanding used in basic EPS	44,171	43,792	44,113	43,754
Effect of dilutive SOSARs, PSAs and RSUs	271		292
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,442	43,792	44,405	43,754
Earnings (loss) per share from continuing operations
Basic	$ 0.19	$ (0.02)	$ 0.44	$ 0.06
Diluted	$ 0.19	$ (0.02)	$ 0.44	$ 0.06