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Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
BASIC EPS:
Net loss	$ (63,539)	$ (70,503)
Adjust for loss attributed to holders of non-vested restricted stock		681
Loss attributed to other common stockholders	$ (63,539)	$ (69,822)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	160,062	145,770
Basic net loss per common share	$ (0.40)	$ (0.48)
DILUTED EPS:
Loss attributed to other common stockholders	$ (63,539)	$ (69,822)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	160,062	145,770
Weighted average number of diluted common shares outstanding	160,062	145,770
Diluted net loss per common share	$ (0.40)	$ (0.48)
Potentially dilutive securities excluded as anti-dilutive	9,017	7,740

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