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Earnings Per Share - Details of Basic and Diluted Earnings (Loss) Per Share (EPS) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Net income (loss) $ (21,541) $ (177,604) $ 7,914
Weighted average common shares outstanding used in basic EPS 44,132 43,768 43,609
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs     830
Weighted average common shares outstanding and common share equivalents used in diluted EPS 44,132 43,768 44,439
Income (loss) per share      
Continuing operations $ (0.57) $ (0.01) $ (0.13)
Discontinued operations $ 0.08 $ (4.05) $ 0.30