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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (2,281)	$ 6,293	$ 5,125	$ 10,896
Weighted average common shares outstanding used in basic EPS	44,343	44,140	44,309	44,084
Effect of dilutive SOSARs, PSAs and RSUs		242	232	267
Weighted average common shares outstanding and common share equivalents used in diluted EPS	44,343	44,382	44,541	44,351
Earnings (loss) per share from continuing operations
Basic	$ (0.05)	$ 0.14	$ 0.12	$ 0.25
Diluted	$ (0.05)	$ 0.14	$ 0.12	$ 0.25