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Earnings Per Common Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator—basic and diluted    
Net income $ 30,181 $ 23,686
Denominator    
Weighted average number of common shares outstanding — basic 40,506 40,384
Effect of dilutive stock options 131 376
Effect of dilutive restricted shares 511 564
Weighted average number of common shares outstanding — diluted 41,148 41,324
Earnings per common share — basic $ 0.75 $ 0.59
Earnings per common share — diluted $ 0.73 $ 0.57
Stock Options And Restricted Shares    
Denominator    
Anti-dilutive securities excluded from computation of earnings per share 2,657 2,173