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Components of Basic and Diluted Net Income (Loss) Per Common Share Computations (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) (numerator) $ 53,976 $ 126,520 $ (29,959) $ (24,873) $ (277,020) $ (31,857) $ (28,910) $ (30,658) $ 125,664 $ (368,445) $ (198,382)
Weighted average common shares (denominator) 95,676 95,627 91,061 85,771         92,053 81,233 77,045
Net income (loss) per share $ 0.56 $ 1.32 $ (0.33) $ (0.29)         $ 1.37 $ (4.54) $ (2.57)
Diluted EPS:                      
Net income (loss) (numerator) $ 53,976 $ 126,520 $ (29,959) $ (24,873) $ (277,020) $ (31,857) $ (28,910) $ (30,658) $ 125,664 $ (368,445) $ (198,382)
Weighted average common shares 95,676 95,627 91,061 85,771         92,053 81,233 77,045
Effect of dilutive securities - common shares issuable                 32    
Adjusted weighted average common shares (denominator) 96,510 96,548 91,061 85,771         92,085 81,233 77,045
Net income (loss) per share $ 0.56 $ 1.31 $ (0.33) $ (0.29)         $ 1.36 $ (4.54) $ (2.57)