Earnings Per Share - Calculation of Basic and Diluted Net Loss 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
BASIC EPS:
Net loss attributed to common stockholders	$ (103,309)	$ (150,332)	$ (209,722)	$ (585,054)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	188,408	186,633	188,044	188,654
Basic net loss per common share	$ (0.55)	$ (0.81)	$ (1.12)	$ (3.10)
DILUTED EPS:
Net loss attributed to common stockholders	$ (103,309)	$ (150,332)	$ (209,722)	$ (585,054)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	188,408	186,633	188,044	188,654
Weighted average number of diluted common shares outstanding	188,408	186,633	188,044	188,654
Diluted net loss per common share	$ (0.55)	$ (0.81)	$ (1.12)	$ (3.10)
Potentially dilutive securities excluded as anti-dilutive	10,361	9,101	10,361	9,101