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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Jul. 16, 2010
Dec. 31, 2008
Income Taxes [Line Items]          
Federal net operating loss carryforwards to the IRC Section 382 limitation       $ 627,800,000 $ 298,400,000
Unrecognized tax benefits 1,900,000   1,300,000    
Unrecognized tax benefits that would affect the effective tax rate if recognized 1,200,000        
Unrecognized tax benefits, accrued gross interest 3,000 17,000      
Unrecognized tax benefits, accrued liability 200,000   200,000    
Beginning tax year, years open for federal examination 2009        
Beginning tax year, years open due to federal net operating loss carryforwards 2003        
Decrease in gross unrecognized tax benefits balance within next twelve months 1,600,000        
Arena Acquisition
          
Income Taxes [Line Items]          
Federal net operating loss carryforwards to the IRC Section 382 limitation       $ 119,900,000  
Minimum
          
Income Taxes [Line Items]          
Number of tax years open for state tax audit (in years) 3 years        
Maximum
          
Income Taxes [Line Items]          
Number of tax years open for state tax audit (in years) 5 years