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Earnings Per Common Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator—basic and diluted        
Net income $ 21,691 $ 10,309 $ 78,419 $ 55,704
Denominator        
Weighted average number of common shares outstanding — basic 41,239 41,094 40,856 40,771
Effect of dilutive stock options 350 426 266 418
Effect of dilutive restricted shares 476 462 483 493
Weighted average number of common shares outstanding — diluted 42,065 41,982 41,605 41,682
Earnings per common share — basic $ 0.53 $ 0.25 $ 1.92 $ 1.37
Earnings per common share — diluted $ 0.52 $ 0.25 $ 1.88 $ 1.34
Stock Options And Restricted Shares        
Denominator        
Anti-dilutive securities excluded from computation of earnings per share 753 1,360 1,595 1,685