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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders Equity [Line Items]      
Retained earnings from which dividends may not be paid without prior approval, total $ 15,293,000 $ 14,312,000 $ 14,130,000
Common stock, capital shares reserved for future issuance 313,919    
Employee Stock Purchase
      
Stockholders Equity [Line Items]      
Employee eligibility period 1 year    
Employees to buy stock under options granted 85.00%    
Options are vested when granted and will expire no later than 27 months    
Shares of common stock reserved for issuance under the plan total 48,011    
Opportunity to receive additional shares of common stock in lieu of cash dividend 95.00%    
Shares of common stock purchased 10,392 19,069 15,818
Common stock, capital shares reserved for future issuance 211,118