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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Operating loss carryforwards $ 756,000 $ 581,000  
Valuation allowance for state tax net operating losses 122,000 108,000  
Unrecognized tax benefits 783,000 756,000 655,000
Potential increase (decrease) in income tax provision, if recognized 500,000 500,000  
Possible reduction in unrecognized tax benefits resulting from audit settlements (300,000)    
Possible increase in unrecognized tax benefits resulting from audit settlements 400,000    
Interest expense related to income tax liabilities 3,000    
Income tax penalties related to income tax liabilities $ 3,000    
Minimum
      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2014    
Maximum
      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2032