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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
BASIC EPS:        
Net income (loss) $ (18,975) $ 54,283 $ (9,850) $ 89,105
Adjust for (income) loss attributed to holders of non-vested restricted stock 198 (559) 109 (910)
Income (loss) attributed to common stockholders $ (18,777) $ 53,724 $ (9,741) $ 88,195
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259
Basic net income (loss) per common share $ (0.13) $ 0.37 $ (0.07) $ 0.62
DILUTED EPS:        
Income (loss) attributed to common stockholders $ (18,777) $ 53,724 $ (9,741) $ 88,195
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 145,300 143,622 145,142 143,259
Add dilutive effect of potential common shares 684 2,407 570 2,327
Weighted average number of diluted common shares outstanding 145,984 146,029 145,712 145,586
Diluted net income (loss) per common share $ (0.13) $ 0.37 $ (0.07) $ 0.61
Potentially dilutive securities excluded as anti-dilutive 5,028 432 5,728 432