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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
BASIC EPS:                      
Net income (loss) $ (78,122) $ (84,143) $ (85,866) $ (70,503) $ (58,658) $ (225,978) $ (18,975) $ 9,125 $ (318,634) $ (294,486) $ 162,664
Adjust for (income) loss attributed to holders of non-vested restricted stock                   3,022 (1,663)
Income (loss) attributed to common stockholders                 $ (318,634) $ (291,464) $ 161,001
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock                 146,178 145,416 144,066
Basic net income (loss) per common share $ (0.53) $ (0.58) $ (0.58) $ (0.48) $ (0.40) $ (1.54) $ (0.13) $ 0.06 $ (2.18) $ (2.00) $ 1.12
DILUTED EPS:                      
Income (loss) attributed to common stockholders                 $ (318,634) $ (291,464) $ 161,001
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock                 146,178 145,416 144,066
Add dilutive effect of potential common shares                     1,310
Weighted average number of diluted common shares outstanding                 146,178 145,416 145,376
Diluted net income (loss) per common share $ (0.53) $ (0.58) $ (0.58) $ (0.48) $ (0.40) $ (1.54) $ (0.13) $ 0.06 $ (2.18) $ (2.00) $ 1.11
Potentially dilutive securities excluded as anti-dilutive                 9,057 7,781 1,088