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Earnings (Loss) Per Common Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator — basic and diluted        
Net income (loss) $ (5,156) $ 26,547 $ 8,860 $ 56,728
Denominator        
Weighted average number of common shares outstanding — basic 39,555 40,820 40,039 40,663
Effect of dilutive stock options   316 129 223
Effect of dilutive restricted shares   463 334 487
Weighted average number of common shares outstanding — diluted 39,555 41,599 40,502 41,373
Earnings (loss) per common share — basic $ (0.13) $ 0.65 $ 0.22 $ 1.40
Earnings (loss) per common share — diluted $ (0.13) $ 0.64 $ 0.22 $ 1.37
Stock Options And Restricted Shares        
Denominator        
Anti-dilutive securities excluded from computation of earnings per share 1,947 1,374 1,469 2,016