Earnings Per Share - Calculation of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
BASIC EPS:
Net income (loss)	$ (85,923)	$ (261,719)	$ (49,447)	$ (28,614)	$ (201,249)	$ (75,042)	$ (10,713)	$ (34,417)	$ (425,703)	$ (321,421)	$ 5,910
Adjust for (income) loss attributed to holders of non-vested restricted stock											(170)
Income (loss) attributed to common stockholders									$ (425,703)	$ (321,421)	$ 5,740
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									203,039	218,643	198,447
Basic net income (loss) per common share	$ (0.44)	$ (1.31)	$ (0.24)	$ (0.14)	$ (0.93)	$ (0.34)	$ (0.05)	$ (0.16)	$ (2.10)	$ (1.47)	$ 0.03
DILUTED EPS:
Income (loss) attributed to common stockholders									$ (425,703)	$ (321,421)	$ 5,740
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									203,039	218,643	198,447
Add dilutive effect of potential common shares											1,435
Weighted average number of diluted common shares outstanding									203,039	218,643	199,882
Diluted net income (loss) per common share	$ (0.44)	$ (1.31)	$ (0.24)	$ (0.14)	$ (0.93)	$ (0.34)	$ (0.05)	$ (0.16)	$ (2.10)	$ (1.47)	$ 0.03
Potentially dilutive securities excluded as anti-dilutive									9,195	9,762	3,289