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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
U.S Fedral
Dec. 31, 2012
U.S. Federal NOL limitations Year One
Dec. 31, 2012
U.S. Federal NOL limitations Year Two
Dec. 31, 2012
U.S. Federal NOL limitations Year Three
Dec. 31, 2011
Pre-Ownership Change
May 28, 2010
Pre-Ownership Change
Dec. 31, 2011
Post-Ownership Change
(Utilization of) Provisions for valuation allowance for net operating losses and credit carrryforwards - U.S. and states $ (19,528,000) $ (6,060,000) $ 7,604,000 $ 0              
Effective income tax rate reconciliation at federal statutory income tax rate 35.00%     0.00%              
Income tax benefit (56,968,000) 171,000 (51,000)                
Tax credit carryforwards, expiration year         2013            
(Utilization of) Provisions for valuation allowance for net operating losses and credit carrryforwards - U.S. and states (19,528,000) (6,060,000) 7,604,000 0              
Operating loss carry forwards   166,000,000       80,000,000 40,000,000 19,000,000 99,000,000   12,000,000
Operating loss carryforwards, expiration dates   2022                  
Deferred tax assets deferred income   16,000,000                  
Common stock, shares issued                   11,750,000  
Unrecognized tax benefits 10,980,000 10,095,000 10,095,000                
Unrecognized tax benefits income tax penalties and interest accrued 400,000 600,000 500,000                
Deferred Tax Assets, Operating Loss Carryforwards, State and Local 1,900,000                    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 12,000,000                    
Operating Loss Carryforwards, Valuation Allowance $ 59,900,000