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Earnings Per Common Share Basic and Diluted (Detail) - Entity [Domain] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator-basic and diluted        
Net income $ 21,709 $ 17,247 $ 45,395 $ 35,364
Denominator        
Weighted average number of common shares outstanding-basic 40,792 39,681 40,607 39,560
Effect of dilutive stock options 451 288 414 322
Effect of dilutive restricted shares 453 781 508 722
Weighted average number of common shares outstanding-diluted 41,696 40,750 41,529 40,604
Earnings per common share-basic $ 0.53 $ 0.43 $ 1.12 $ 0.89
Earnings per common share-diluted $ 0.52 $ 0.42 $ 1.09 $ 0.87
Stock Options and Restricted Shares        
Denominator        
Anti-dilutive securities excluded from computation of earnings per share 1,524 3,637 1,849 3,408