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Earnings Per Common Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator—basic and diluted        
Net income $ 26,547 $ 21,709 $ 56,728 $ 45,395
Denominator        
Weighted average number of common shares outstanding — basic 40,820 40,792 40,663 40,607
Effect of dilutive stock options 316 451 223 414
Effect of dilutive restricted shares 463 453 487 508
Weighted average number of common shares outstanding — diluted 41,599 41,696 41,373 41,529
Earnings per common share — basic $ 0.65 $ 0.53 $ 1.40 $ 1.12
Earnings per common share — diluted $ 0.64 $ 0.52 $ 1.37 $ 1.09
Stock Options And Restricted Shares        
Denominator        
Anti-dilutive securities excluded from computation of earnings per share 1,374 1,524 2,016 1,849