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Fair Value Measurements of Marketable Debt Securities (Detail) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities, Amortized Cost $ 21,146,000 $ 30,912,000
Total debt securities, Gross Unrealized Gains 254,000 434,000
Total debt securities, Gross Unrealized Losses (2,000) (9,000)
Total debt securities 21,398,000 31,337,000
Total debt securities, Other-than-temporary Impairments      
Municipal bonds - available for sale
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities, Amortized Cost 21,146,000 28,745,000
Total debt securities, Gross Unrealized Gains 254,000 352,000
Total debt securities, Gross Unrealized Losses (2,000) (9,000)
Total debt securities 21,398,000 29,088,000
Total debt securities, Other-than-temporary Impairments      
Municipal Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities, Amortized Cost   2,167,000
Total debt securities, Gross Unrealized Gains   82,000
Total debt securities   2,249,000
Total debt securities, Other-than-temporary Impairments