Earnings Per Share - Schedule of EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic:
Net Loss	$ (113,231)	$ (72,959)
Less: Net loss allocable to participating RSUs	0	0
Net loss available for basic common shares	$ (113,231)	$ (72,959)
Weighted average common shares outstanding	342,914	340,369
Basic net loss per common share (in USD per share)	$ (0.33)	$ (0.21)
Diluted:
Net Loss	$ (113,231)	$ (72,959)
Less: Net loss allocable to participating RSUs	0	0
Net loss available for diluted common shares	$ (113,231)	$ (72,959)
Weighted average common shares outstanding	342,914	340,369
Weighted average common equivalent shares arising from:
Dilutive stock options and non-participating RSUs (in shares)	0	0
Weighted average number of common and potential common shares	342,914	340,369
Diluted net loss per common share (in USD per share)	$ (0.33)	$ (0.21)