Net Income (Loss) Per Common Share - Summary of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Loss from continuing operations	$ (4,913)	$ (108,077)
Less: Preferred stock cumulative dividends and deemed dividends	(14,529)	(2,951)
Numerator for basic income (loss) from continuing operations per common share	(19,442)	(111,028)
Numerator for diluted income (loss) from continuing operations per common share	(19,442)	(111,028)
Loss from discontinued operations, net of tax (Note 2)	0	(140,114)
Numerator for basic undistributed net loss per common share	(19,442)	(251,142)
Numerator for diluted undistributed net loss per common share	$ (19,442)	$ (251,142)
Weighted average common shares outstanding, basic (in shares)	42,461	42,111
Weighted average common shares outstanding, diluted (in shares)	42,461	42,111
Weighted average warrants outstanding, basic (in shares)	211	0
Weighted average warrants outstanding, diluted (in shares)	211	0
Weighted average common shares outstanding, basic (in shares)	42,672	42,111
Weighted average common shares outstanding, diluted (in shares)	42,672	42,111
Basic loss from continuing operations per common share (in dollars per share)	$ (0.46)	$ (2.64)
Basic loss from discontinuing operations per common share (in dollars per share)	0	(3.32)
Basic net loss per share (in dollars per share)	(0.46)	(5.96)
Diluted loss from continuing operations per common share (in dollars per share)	(0.46)	(2.64)
Diluted loss from discontinuing operations per common share (in dollars per share)	0	(3.32)
Diluted net loss per share (in dollars per share)	(0.46)	(5.96)
Cash dividends declared per share (in dollars per share)	$ 0	$ 0