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Rhapsody Joint Venture (Additional Information) (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2010
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]          
Cash payments     $ 4,324 $ 5,299 $ 5,636
Losses recorded in the operations of Rhapsody     14,521 4,452 6,268
Carrying value of Rhapsody investment     0 10,000  
Advance to Rhapsody     $ 5,000 0 0
Rhapsody America LLC          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (percent)     43.00%    
Cash payments   $ 18,000      
Liquidation preference     $ 10,000    
Losses recorded in the operations of Rhapsody     14,500 4,500 $ 6,300
Carrying value of Rhapsody investment     $ 0 $ 10,000  
Advance to Rhapsody $ 5,000        
Effective interest rate (as a percent)     9.00%    
Interest income from related party     $ 200    
Prime Rate | Rhapsody America LLC          
Schedule of Equity Method Investments [Line Items]          
Basis spread on variable rate (as a percent) 5.25%