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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]        
Income tax expense (benefit) $ 74,000 $ 1,780,000 $ 296,000 $ 259,000
Effective Income Tax Rate, Continuing Operations 0.40%   0.90%  
Statutory Income Tax Rate     34.00% 34.00%
Deferred Tax Assets, Valuation Allowance $ 12,700,000   $ 12,700,000