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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Common Share (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share Disclosure [Line Items]        
Net income $ 11,320,000 $ 9,828,000 $ 19,899,000 $ 17,595,000
Basic earnings per common share, Income 11,320,000 9,828,000 19,899,000 17,595,000
Net Income, Available to Common Stockholders, Diluted, Total $ 11,320,000 $ 9,828,000 $ 19,899,000 $ 17,595,000
Basic earnings per common share, Shares 67,296,000 66,517,000 67,189,000 66,459,000
Effect of dilutive securities Options 932,000 1,028,000 966,000 1,040,000
Number of Shares Outstanding, Diluted 68,228,000 67,545,000 68,155,000 67,499,000
Basic earnings per common share $ 0.17 $ 0.15 $ 0.30 $ 0.26
Options     $ (0.01)  
Diluted earnings per common share $ 0.17 $ 0.15 $ 0.29 $ 0.26