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Employee Benefits and Stock Compensation - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 18, 2001
Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Profit sharing and retirement plan service period 1 year      
Profit sharing and retirement contributions charged to operations $ 807,000 $ 771,000 $ 361,000  
Granted options and stock appreciation rights, Shares 50,000      
Stock options vesting period 5 years      
Stock options or stock appreciation rights contractual life 10 years      
Repurchase program approval date Sep. 18, 2001      
Share repurchase program, shares authorized 165,000      
Maximum remaining number of repurchase Shares under repurchase plan 12,000      
Number of repurchase program       1
Grant of stock options or SSARS 49,000 0 0  
Risk free interest rate 2.50%      
Dividends 0      
Weighted average expected lives of stock options 5 years      
Volatility of common stock 26.50%      
Forfeiture experience 22.00%      
Windfall tax benefits realized from the exercise of stock options 0      
Stock options exercised 0      
Unrecognized compensation cost of stock options and SAR's 0      
Recognized non-cash compensation expense before tax 246,000 796,000 588,000  
Recognized non-cash compensation expense after tax 151,000 489,000 361,000  
Compensation cost capitalized 0      
Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards contractual life period 5 years      
Proportion of restricted stock unit 160.00%      
Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock awards contractual life period 3 years      
Proportion of restricted stock unit 0.00%      
1991 Plan [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized under stock plan 198,000      
1996 Plan [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized under stock plan 198,000      
2000 Plan [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized under stock plan 264,000      
2008 Plan [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized under stock plan 300,000      
2013 Plan [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized under stock plan 1,300,000      
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options vesting period 5 years      
Cash utilized for settle equity instruments granted under stock option awards 0      
Stock Appreciation Rights (SARs) [Member] | 1991 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted options and stock appreciation rights, Shares 166,000      
Stock Appreciation Rights (SARs) [Member] | 1996 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted options and stock appreciation rights, Shares 187,000      
Stock Appreciation Rights (SARs) [Member] | 2000 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted options and stock appreciation rights, Shares 158,000      
Stock Appreciation Rights (SARs) [Member] | 2008 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted options and stock appreciation rights, Shares 0      
Stock Appreciation Rights (SARs) [Member] | 2013 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted options and stock appreciation rights, Shares 49,000      
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issue of shares of restricted awards 9,000      
Stock options vesting period 5 years      
Restricted stock awards vested 15,000      
Restricted stock awards cancelled 6,000      
Number of non-vested restricted stock award shares 168,000      
Increase in non-vested restricted stock awards outstanding 0      
Number of restricted stock awards cancelled in that period 12,000      
Number of Non-Vested Stock Options 49,000      
Cash utilized to settle equity instruments under stock awards $ 0      
Restricted Stock [Member] | 2008 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issue of shares of restricted awards   15,000 229,000  
Issue of shares of restricted awards, price per share   $ 8.10 $ 7.10  
Restricted Stock [Member] | 2013 Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issue of shares of restricted awards 195,000      
Issue of shares of restricted awards, price per share $ 11.00      
Restricted Stock Units (RSUs) [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issue of shares of restricted awards 195,000      
Restricted stock awards vested 0      
Restricted stock awards cancelled 18,000      
Number of non-vested restricted stock award shares 177,000