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
	Mar. 31, 2019	Mar. 31, 2018
BASIC EPS:
Net loss attributed to common stockholders	$ (28,614)	$ (34,417)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	211,868	220,783
Basic net loss per common share	$ (0.14)	$ (0.16)
DILUTED EPS:
Net loss attributed to common stockholders	$ (28,614)	$ (34,417)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	211,868	220,783
Weighted average number of diluted common shares outstanding	211,868	220,783
Diluted net loss per common share	$ (0.14)	$ (0.16)
Potentially dilutive securities excluded as anti-dilutive	10,033	9,738