Earnings Per Share - Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
BASIC EPS:
Net loss attributed to common stockholders	$ (82,998)	$ (112,111)	$ (292,720)	$ (697,165)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	188,965,000	187,280,000	188,355,000	188,193,000
Basic net loss per common share	$ (0.44)	$ (0.60)	$ (1.55)	$ (3.70)
DILUTED EPS:
Net loss attributed to common stockholders	$ (82,998)	$ (112,111)	$ (292,720)	$ (697,165)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	188,965,000	187,280,000	188,355,000	188,193,000
Add dilutive effect of potential common shares	0	0	0	0
Weighted average number of diluted common shares outstanding	188,965,000	187,280,000	188,355,000	188,193,000
Diluted net loss per common share	$ (0.44)	$ (0.60)	$ (1.55)	$ (3.70)
Potentially dilutive securities excluded as anti-dilutive	9,334,000	8,490,000	9,334,000	8,490,000