Fair Value Measurements (Components of Change in Fair Value) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Less: Impairment charge $ (19,364) $ 0 $ 0
Fair Value, Measurements, Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015   17,339  
Fair value balance at December 31, 2015   17,339  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015 (181)    
Fair value balance at December 31, 2015 (181) (181)  
Fair Value, Measurements, Recurring | Pulser Media      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015 [1]   17,339  
Fair value balance at December 31, 2015 [1]   17,339  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015   17,339  
Fair value balance at December 31, 2015   17,339  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015 (181)    
Fair value balance at December 31, 2015 (181) (181)  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Contingent Consideration      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015 (181)    
Add: Additions to contingent consideration 0    
Fair value balance at December 31, 2015 (181) (181)  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Pulser Media      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value balance at January 1, 2015 0 17,339 [1]  
Add: Additions to equity interest in Pulser 2,025    
Less: Impairment charge (19,364)    
Fair value balance at December 31, 2015 $ 0 $ 17,339 [1]  
[1] The fair value of the equity interest in Pulser Media, Inc. (the parent company of Rdio) ("Pulser") was determined using inputs that are supported by little or no market activity (a Level 3 measurement). Due to the volatility in market conditions that have an impact on Pulser's operations, during the year ended December 31, 2015, the Company recognized an impairment charge of $19.4 million related to the decline in the fair value of the equity interest in Pulser. There were no similar charges in 2014.