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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
Dec. 31, 2012
Jul. 16, 2010
Dec. 31, 2008
Income Taxes              
Income tax expense (benefit) $ 508,000 $ (100,617,000) $ 4,937,000 $ (100,546,000)      
Valuation allowance, deferred tax asset, change in amount     4,015,000 (100,288,000)      
Federal net operating loss carryforwards subject to the IRC Section 382 limitation           627,800,000 298,400,000
Unrecognized tax benefits 1,900,000   1,900,000   1,300,000    
Unrecognized tax benefits that would affect the effective tax rate if recognized 1,200,000   1,200,000        
Unrecognized tax benefits, accrued liability 200,000   200,000   200,000    
Decrease in gross unrecognized tax benefits balance within next twelve months 1,600,000   1,600,000        
Arena Acquisition
              
Income Taxes              
Federal net operating loss carryforwards subject to the IRC Section 382 limitation           119,900,000  
Beginning tax year
              
Income Taxes              
Beginning tax year, years open for federal examination     2009        
Beginning tax year as result of federal NOL carryforwards
              
Income Taxes              
Beginning tax year, years open for federal examination     2003        
Minimum
              
Income Taxes              
Number of tax years open for state tax audit (in years)     3 years        
Maximum
              
Income Taxes              
Number of tax years open for state tax audit (in years)     5 years        
Federal Alternative Minimum Tax
              
Income Taxes              
Accrued income taxes, current 4,000,000   4,000,000        
Deferred tax assets, gross 4,000,000   4,000,000        
Valuation allowance, deferred tax asset, change in amount     4,015,000        
Parent Company
              
Income Taxes              
Income tax expense (benefit) 437,000 (100,684,000) 4,791,000 (100,703,000)      
Parent Company | Federal Alternative Minimum Tax
              
Income Taxes              
Income tax expense (benefit)     $ 4,791,000