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Earnings Per Share - Calculation of Basic and Diluted Net Loss per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
BASIC EPS:
Net loss attributed to common stockholders	$ (10,713)	$ (92,184)	$ (45,130)	$ (155,723)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	220,093	201,204	220,436	180,747
Basic net loss per common share	$ (0.05)	$ (0.46)	$ (0.21)	$ (0.86)
DILUTED EPS:
Net loss attributed to common stockholders	$ (10,713)	$ (92,184)	$ (45,130)	$ (155,723)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	220,093	201,204	220,436	180,747
Weighted average number of diluted common shares outstanding	220,093	201,204	220,436	180,747
Diluted net loss per common share	$ (0.05)	$ (0.46)	$ (0.21)	$ (0.86)
Potentially dilutive securities excluded as anti-dilutive	9,903	9,475	9,903	9,475

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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