Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 131,000 $ 130,000 $ 211,000 $ 191,000
Unrecognized tax benefits     100,000  
Period of change of unrecognized tax benefits     12 months  
Accrued interest and penalties 0   0  
Taxable Income Adjustment from Tax Examination $ 0   $ 0