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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Income from continuing operations	$ 6,293	$ 1,280	$ 10,896	$ 3,544
Weighted average common shares outstanding used in basic EPS	44,140	43,770	44,084	43,735
Effect of dilutive SOSARs, PSAs and RSUs	242	717	267	796
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,382	44,487	44,351	44,531
Earnings per share from continuing operations
Basic	$ 0.14	$ 0.03	$ 0.25	$ 0.08
Diluted	$ 0.14	$ 0.03	$ 0.25	$ 0.08