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Earnings (Loss) Per Common Share - Schedule of Earnings Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator — basic and diluted        
Net income (loss) $ 43,609 $ (5,156) $ 82,554 $ 8,860
Denominator        
Weighted average number of common shares outstanding — basic (in shares) 37,001,000 39,555,000 36,851,000 40,039,000
Effect of dilutive stock options (in shares) 558,000 0 430,000 129,000
Effect of dilutive restricted shares (in shares) 712,000 0 661,000 334,000
Weighted average number of common shares outstanding — diluted (in shares) 38,271,000 39,555,000 37,942,000 40,502,000
Earnings (loss) per common share — basic (in dollars per share) $ 1.18 $ (0.13) $ 2.24 $ 0.22
Earnings (loss) per common share — diluted (in dollars per share) $ 1.14 $ (0.13) $ 2.18 $ 0.22
Antidilutive stock options and restricted shares (in shares)   377,389    
Stock Options And Restricted Shares        
Denominator        
Antidilutive stock options and restricted shares (in shares) 44,000 1,947,000 330,000 1,469,000