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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Proceeds from sale of investment   $ 0 $ (352)  
Gain (loss) on sale of investment   3 299  
Financial assets fair value   $ 92,847   $ 104,793
J-Stream        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Proceeds from sale of investment     (400)  
Gain (loss) on sale of investment     $ 300  
Rhapsody America LLC | Other Owner        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of ownership interest in Rhapsody held by third party     43.00%  
Warrants issued by Rhapsody | Related Party Debt Obligation        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Expected term 5 years      
Expected volatility rate 55.00%      
Financial assets fair value $ 1,200