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Components of Basic and Diluted Net Income (Loss) Per Common Share Computations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic EPS:        
Net (loss) income $ (32,886) $ 126,520 $ (84,549) $ 71,690
Weighted average common shares (denominator) 104,703,000 95,627,000 100,136,000 90,838,000
Net income (loss) per share $ (0.31) $ 1.32 $ (0.84) $ 0.79
Diluted EPS:        
Net (loss) income $ (32,886) $ 126,520 $ (84,549) $ 71,690
Weighted average common shares (denominator) 104,703,000 95,627,000 100,136,000 90,838,000
Effect of dilutive securities - common shares issuable   921,000   36,000
Adjusted weighted average common shares (denominator) 104,703,000 96,549,000 100,136,000 90,873,000
Net income (loss) per share $ (0.31) $ 1.31 $ (0.84) $ 0.79