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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Income Taxes Additional Information [Line Items]    
Unrecognized tax benefits   $ 5,151,000
Federal and State Net Operating Loss Carryforwards 21.537000  
Operating Loss Carryforwards Expiration Year 2018  
Tax Credit Carryforward Expiration Year 2017  
State and Local Jurisdiction [Member]
    
Income Taxes Additional Information [Line Items]    
Tax Credit Carryforward, Amount $ 1,399,000