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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
BASIC EPS:
Net income (loss)	$ 195,402	$ (33,769)	$ (92,184)	$ (63,539)	$ (78,122)	$ (84,143)	$ (85,866)	$ (70,503)	$ 5,910	$ (318,634)	$ (294,486)
Adjust for (income) loss attributed to holders of non-vested restricted stock									(170)		3,022
Income (loss) attributed to common stockholders									$ 5,740	$ (318,634)	$ (291,464)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									198,447	146,178	145,416
Basic net income (loss) per common share	$ 0.88	$ (0.16)	$ (0.46)	$ (0.40)	$ (0.53)	$ (0.58)	$ (0.58)	$ (0.48)	$ 0.03	$ (2.18)	$ (2.00)
DILUTED EPS:
Income (loss) attributed to common stockholders									$ 5,740	$ (318,634)	$ (291,464)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock									198,447	146,178	145,416
Add dilutive effect of potential common shares									1,435
Weighted average number of diluted common shares outstanding									199,882	146,178	145,416
Diluted net income (loss) per common share	$ 0.88	$ (0.16)	$ (0.46)	$ (0.40)	$ (0.53)	$ (0.58)	$ (0.58)	$ (0.48)	$ 0.03	$ (2.18)	$ (2.00)
Potentially dilutive securities excluded as anti-dilutive									3,289	9,057	7,781

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