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Net Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net loss from continuing operations	$ (8,890)	$ (2,854)	$ (32,479)	$ (87,495)
Net loss from discontinued operations, net of tax	(71,234)	(20,037)	(218,402)	(36,158)
Net loss	(80,124)	(22,891)	(250,881)	(123,653)
Undistributed losses	$ (80,124)	$ (22,891)	$ (250,881)	$ (123,653)
Weighted average number of shares—basic and diluted	82,707	80,908	81,892	80,370
Net loss from continuing operations	$ (0.11)	$ (0.04)	$ (0.40)	$ (1.09)
Net loss attributable to common stock per share from discontinued operations-basic and diluted	(0.86)	(0.25)	(2.67)	(0.45)
Net loss	$ (0.97)	$ (0.29)	$ (3.07)	$ (1.54)

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