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Stock Options and Restricted Stock - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Companies
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total tax expense | $ $ 2,203,000 $ 2,841,000 $ 2,024,000  
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 | Companies 6      
Dividend yield assumed 0.00%      
Cash dividends paid | $     0  
Compensation expense | $ $ 100,000 300,000 $ 300,000  
Total tax expense | $ $ 81,000 $ 38,000    
Restricted stock outstanding 1,600 2,400 6,400 8,000
2010 Restricted Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense | $ $ 300,000 $ 200,000 $ 200,000  
Total tax expense | $ $ 13,000 7,000 $ 18,000  
Shares authorized under incentive plan 100,000      
Common stock available for future awards 26,074      
Restricted stock award for a number of shares | $ $ 45,000 $ 30,000    
Restricted stock outstanding 7,112 5,229 5,376 7,833
Restricted stock granted 7,112 5,229 5,376  
2010 Restricted Stock Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional restricted stock award for a number of shares 15,000      
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 380,935      
Restricted stock granted 50,461      
2012 Equity and Incentive Compensation Plan [Member] | Share Based Grants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense | $ $ 600,000 $ 600,000 $ 300,000  
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 | $ $ 200,000 $ 400,000 $ 600,000  
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   4,312