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Share-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Based Compensation [Line Items]      
Tax benefit associated with compensation expense $ 19,000 $ 13,000 $ 14,000
Total compensation cost 48,000 33,000 35,000
Total compensation cost 48,000 33,000 35,000
Cash received from option exercise 136,000 195,000 55,000
Actual tax benefit realized for the tax deductions 58,000 30,000 9,000
Unrecognized compensation cost 1,000,000    
Weighted-average period cost over which cost is expected to be recognized 3 years 4 months 24 days    
Option activity under the 2013 Plan [Member]
      
Stock Based Compensation [Line Items]      
Maximum common shares issued under the plan 691,700    
Non-option awards granted 400,000    
Number of shares available incentive stock options 100,000    
Weighted average grant-date fair value of options granted $ 5.74 $ 3.25 $ 2.82
Option activity under the 2003 Plan [Member]
      
Stock Based Compensation [Line Items]      
Maximum common shares issued under the plan 337,500    
Non-option awards granted 168,750    
Additional common shares available for issuance   393,750  
Grants vest at the end of 4 years    
Option activity under the 2003 Plan [Member] | Minimum [Member]
      
Stock Based Compensation [Line Items]      
Grants vest at the end of 3 years    
Option activity under the 2003 Plan [Member] | Maximum [Member]
      
Stock Based Compensation [Line Items]      
Grants vest at the end of 5 years    
Restricted Stock [Member]
      
Stock Based Compensation [Line Items]      
Tax benefit associated with compensation expense 115,000 75,000 40,000
Total compensation cost $ 288,000 $ 187,000 $ 100,000