(Loss) Earnings 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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Basic (loss) earnings per share	$ (131,029)	$ 52,651	$ (187,548)	$ 15,631
Diluted (loss) earnings per share	$ (131,029)	$ 52,651	$ (187,548)	$ 15,631
Basic (loss) earnings per share	78,093	81,520	78,153	82,432
Effect of dilutive incentive-based awards, Shares		647		784
Diluted (loss) earnings per share	78,093	82,167	78,153	83,216
Basic (loss) per share, Per Share Amount	$ (1.68)	$ 0.65	$ (2.40)	$ 0.19
Diluted (loss) per share, Per Share Amount	$ (1.68)	$ 0.64	$ (2.40)	$ 0.19