Net 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								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net (loss) income		$ (1,805,320)	$ (27,581)	$ 115,185	$ 1,419	$ (1,764,422)	$ 48,539	$ (79,836)	$ 49,238	$ (1,716,297)	$ (1,746,481)	$ 333,146
Participating basic earnings	[1]									(251)	(245)	(3,751)
Basic net (loss) income attributed to common stockholders										(1,716,548)	(1,746,726)	329,395
Reallocation of participating earnings	[1]									0	0	5
Diluted net (loss) income attributed to common stockholders										$ (1,716,548)	$ (1,746,726)	$ 329,400
Net (loss) income per common share:
Basic		$ (7.27)	$ (0.11)	$ 0.46	$ 0.01	$ (7.15)	$ 0.19	$ (0.32)	$ 0.20	$ (6.92)	$ (7.10)	$ 1.34
Diluted		$ (7.27)	$ (0.11)	$ 0.46	$ 0.01	$ (7.15)	$ 0.19	$ (0.32)	$ 0.20	$ (6.92)	$ (7.10)	$ 1.34

[1] Restricted stock Liability 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.