Earnings (Loss) Per Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Basic earnings (loss) per share	$ 127,762	$ (131,029)	$ 82,878	$ (187,548)
Diluted earnings (loss) per share	$ 127,762	$ (131,029)	$ 82,878	$ (187,548)
Basic	78,986	78,093	78,724	78,153
Effect of dilutive incentive-based awards, Shares	1,191		1,399
Diluted earnings (loss) per share	80,177	78,093	80,123	78,153
Earnings (loss) per share, basic	$ 1.62	$ (1.68)	$ 1.05	$ (2.40)
Earnings (loss) per share, diluted	$ 1.59	$ (1.68)	$ 1.03	$ (2.40)