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Income Taxes (Narrative) (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Disclosure [Abstract]            
Effective tax rate 81.80%   (30.30%) 35.00% (12.90%)  
Income tax provision (benefit) $ 1,403,000   $ (1,712,000) $ 2,636,000 $ (1,845,000)  
Federal statutory rate       35.00%    
Estimated annual effective tax rate 30.60% 80.20%        
Deferred tax expense   2,500,000   2,500,000    
Reduction in additional paid-in-capital 0     100,000    
Shortfalls in income tax expense 200,000     500,000    
Unrecognized tax benefits which impact effective tax rate 1,400,000     1,400,000   1,400,000
Accrued interest and penalties on unrecognized tax benefits $ 700,000     $ 700,000   $ 600,000