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Calculation of Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
BASIC EPS:        
Net income (loss) $ (225,978) $ 15,976 $ (235,828) $ 105,081
Adjust for (income) loss attributed to holders of non-vested restricted stock 2,359 (160) 2,436 (1,074)
Income (loss) attributed to common stockholders $ (223,619) $ 15,816 $ (233,392) $ 104,007
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,662 144,798 145,317 143,778
Basic net income (loss) per common share $ (1.54) $ 0.11 $ (1.61) $ 0.72
DILUTED EPS:        
Income (loss) attributed to common stockholders $ (223,619) $ 15,816 $ (233,392) $ 104,007
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,662 144,798 145,317 143,778
Add dilutive effect of potential common shares 2,193 2,323
Weighted average number of diluted common shares outstanding 145,662 146,991 145,317 146,101
Diluted net income (loss) per common share $ (1.54) $ 0.11 $ (1.61) $ 0.71
Potentially dilutive securities excluded as anti-dilutive 7,840 442 7,840 473