Income (Loss) Per Common Share - Computations of Basic and Diluted Income (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share Reconciliation [Abstract]
Net loss		$ (350,267)	$ (156,472)	$ 27,151	$ (748,790)	$ (167,583)	$ 166,195	$ (479,588)	$ (750,178)
Participating earnings	[1]	0			0			0	0
Basic net loss attributed to common stockholders		(350,267)			(748,790)			(479,588)	(750,178)
Reallocation of participating earnings	[1]	0			0			0	0
Diluted net loss attributed to common stockholders		$ (350,267)			$ (748,790)			$ (479,588)	$ (750,178)
Net loss per common share:
Basic		$ (1.44)			$ (3.12)			$ (1.98)	$ (3.10)
Diluted		$ (1.44)			$ (3.12)			$ (1.98)	$ (3.10)

[1] Restricted Stock Awards represent participating securities because they participate in nonforfeitable dividends or distributions with common equity owners. Income allocable to participating securities represents the distributed and undistributed earnings attributable to the participating securities. Participating securities, however, do not participate in undistributed net losses.