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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
BASIC EPS:
Net income (loss)	$ (201,249)	$ (75,042)	$ (10,713)	$ (34,417)	$ 195,402	$ (33,769)	$ (92,184)	$ (63,539)	$ (321,421)	$ 5,910	$ (318,634)
Adjust for (income) loss attributed to holders of non-vested restricted stock										(170)
Income (loss) attributed to common stockholders									$ (321,421)	$ 5,740	$ (318,634)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									218,643	198,447	146,178
Basic net income (loss) per common share	$ (0.93)	$ (0.34)	$ (0.05)	$ (0.16)	$ 0.88	$ (0.16)	$ (0.46)	$ (0.40)	$ (1.47)	$ 0.03	$ (2.18)
DILUTED EPS:
Income (loss) attributed to common stockholders									$ (321,421)	$ 5,740	$ (318,634)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									218,643	198,447	146,178
Add dilutive effect of potential common shares										1,435
Weighted average number of diluted common shares outstanding									218,643	199,882	146,178
Diluted net income (loss) per common share	$ (0.93)	$ (0.34)	$ (0.05)	$ (0.16)	$ 0.88	$ (0.16)	$ (0.46)	$ (0.40)	$ (1.47)	$ 0.03	$ (2.18)
Potentially dilutive securities excluded as anti-dilutive									9,762	3,289	9,057

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