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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
BASIC EPS:        
Net loss $ (84,143) $ (225,978) $ (240,512) $ (235,828)
Adjust for loss attributed to holders of non-vested restricted stock   2,359   2,436
Loss attributed to other common stockholders $ (84,143) $ (223,619) $ (240,512) $ (233,392)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317
Basic net loss per common share $ (0.58) $ (1.54) $ (1.65) $ (1.61)
DILUTED EPS:        
Loss attributed to other common stockholders $ (84,143) $ (223,619) $ (240,512) $ (233,392)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 146,326 145,662 146,014 145,317
Weighted average number of diluted common shares outstanding 146,326 145,662 146,014 145,317
Diluted net loss per common share $ (0.58) $ (1.54) $ (1.65) $ (1.61)
Potentially dilutive securities excluded as anti-dilutive 9,141 7,840 9,141 7,840