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Stock Options and Restricted Stock - Stock Options Outstanding (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, Exercised (193,204) (294,165) (256,300)  
2005 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares outstanding, Beginning balance 282,083 576,248 832,548  
Shares, Granted 0 0 0  
Shares, Exercised (193,204) (294,165) (256,300)  
Shares Canceled, forfeited, or expired 0 0 0  
Shares outstanding, Ending balance 88,879 282,083 576,248 832,548
Shares exercisable, Ending balance 88,879 282,083 557,448  
Weighted- Average Exercise Price, Beginning balance $ 11.30 $ 11.12 $ 10.51  
Weighted- Average Exercise Price, Granted 0 0 0  
Weighted- Average Exercise Price, Exercised 9.55 9.09 9.00  
Weighted- Average Exercise Price, Canceled, forfeited, or expired 0 0 0  
Weighted- Average Exercise Price, Ending balance 12.10 11.30 11.12 $ 10.51
Weighted- Average Exercise Price, Exercisable Ending balance $ 12.10 $ 11.30 $ 10.91  
Weighted- Average Remaining Contractual Life (in years) 4 years 3 months 18 days 3 years 7 months 6 days 3 years 9 months 18 days 4 years 7 months 6 days
Weighted- Average Remaining Contractual Life (in years), Exercisable 4 years 3 months 18 days 3 years 7 months 6 days 3 years 8 months 12 days  
Weighted- Average Remaining Contractual Life (in years) 4 years 3 months 18 days 3 years 7 months 6 days 3 years 9 months 18 days 4 years 7 months 6 days