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Stock Options and Restricted Stock - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total tax expense $ 2,024,000 $ 421,000 $ 1,043,000  
2005 Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options exercise price 100.00%      
Company's voting stock 10.00%      
Stock options exercise price 110.00%      
Duration for Stock option grants exercisable 10 years      
Stock options exercise period 5 years      
Expiration of stock option 90 days      
Unexercised portion of stock option remains exercisable 1 year      
Number of companies used for the estimation of expected volatility 6      
Dividend yield assumed 0.00%      
Compensation expense 257,000 244,000 261,000  
Total tax expense 4,000      
Restricted stock outstanding 6,400 8,000    
Restricted stock granted   8,000    
2010 Restricted Stock Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 194,000 210,000 210,000  
Total tax expense 18,000 16,000 18,000  
Shares authorized under incentive plan 100,000      
Common stock available for future awards 38,415      
Restricted stock award for a number of shares 30,000      
Restricted stock outstanding 5,376 7,833 9,513 11,830
Restricted stock granted 5,376 7,833 9,513  
2012 Equity and Incentive Compensation Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized under incentive plan 500,000      
Common stock available for future awards 417,391      
Restricted stock granted 80,278      
2012 Equity and Incentive Compensation Plan [Member] | Share Based Grants [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 319,000      
2012 Equity and Incentive Compensation Plan [Member] | Long-Term Incentive Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 638,000      
2012 Equity and Incentive Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock granted   2,331