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Net Loss per Common Share - Summary of Calculation of Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]    
Weighted average shares outstanding - basic and diluted 60,574 60,014
Loss from continuing operations $ (22,584) $ (394,665)
Continuing operations per basic and diluted (in usd per share) $ (0.37) $ (6.58)
Loss from discontinued operations, net of tax $ (39,787) $ (42,347)
Discontinued operations per basic and diluted (in usd per share) $ (0.66) $ (0.70)
Net income (loss) $ (62,371) $ (437,012)
Basic and diluted (in usd per share) $ (1.03) $ (7.28)