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Rhapsody Joint Venture (Additional Information) (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2010
Jun. 30, 2016
Jun. 30, 2015
Feb. 28, 2015
Schedule of Equity Method Investments [Line Items]            
Losses recorded in the operations of Rhapsody $ 396,000 $ 6,916,000   $ 396,000 $ 13,096,000  
Loan to investee       $ 0 5,000,000  
Rhapsody America LLC            
Schedule of Equity Method Investments [Line Items]            
Percentage of ownership interest in Rhapsody 42.00%     42.00%    
Payments for restructuring     $ 18,000,000      
Liquidation preference amount $ 10,000,000     $ 10,000,000    
Losses recorded in the operations of Rhapsody 400,000 $ 6,900,000   400,000 $ 13,100,000  
Carrying value $ 0     $ 0    
Rhapsody America LLC | Other Owner            
Schedule of Equity Method Investments [Line Items]            
Percentage of ownership interest in Rhapsody held by third party           43.00%