Annual report pursuant to Section 13 and 15(d)

Business Combinations - Summary of the allocation of estimated fair values of net assets acquired including related estimated useful lives (Details)

v3.8.0.1
Business Combinations - Summary of the allocation of estimated fair values of net assets acquired including related estimated useful lives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 303,875 $ 71,243 $ 306,691
Ticketfly      
Business Acquisition [Line Items]      
Tangible assets acquired, net 27,640    
Deferred tax liability (1,738)    
Net assets acquired 102,702    
Goodwill 232,641    
Total 335,343    
Ticketfly | FCC license—broadcast radio      
Business Acquisition [Line Items]      
Estimated fair value 0    
Ticketfly | Customer relationships—clients      
Business Acquisition [Line Items]      
Estimated fair value $ 37,300    
Estimated useful life in years 8 years    
Ticketfly | Developed technology      
Business Acquisition [Line Items]      
Estimated fair value $ 28,100    
Estimated useful life in years 5 years    
Ticketfly | Tradename      
Business Acquisition [Line Items]      
Estimated fair value $ 10,400    
Estimated useful life in years 8 years    
Ticketfly | Customer relationships—users      
Business Acquisition [Line Items]      
Estimated fair value $ 1,000    
Estimated useful life in years 2 years    
Rdio      
Business Acquisition [Line Items]      
Tangible assets acquired, net $ 1,969    
Deferred tax liability 0    
Net assets acquired 29,369    
Goodwill 48,131    
Total 77,500    
Rdio | FCC license—broadcast radio      
Business Acquisition [Line Items]      
Estimated fair value 0    
Rdio | Customer relationships—clients      
Business Acquisition [Line Items]      
Estimated fair value 0    
Rdio | Developed technology      
Business Acquisition [Line Items]      
Estimated fair value 26,400    
Rdio | Tradename      
Business Acquisition [Line Items]      
Estimated fair value $ 1,000    
Estimated useful life in years 3 years    
Rdio | Tradename | Minimum      
Business Acquisition [Line Items]      
Estimated useful life in years 2 years    
Rdio | Tradename | Maximum      
Business Acquisition [Line Items]      
Estimated useful life in years 5 years    
Rdio | Customer relationships—users      
Business Acquisition [Line Items]      
Estimated fair value $ 0    
Other      
Business Acquisition [Line Items]      
Tangible assets acquired, net (490)    
Deferred tax liability (49)    
Net assets acquired 2,464    
Goodwill 23,103    
Total 25,567    
Other | FCC license—broadcast radio      
Business Acquisition [Line Items]      
Estimated fair value 193    
Other | Customer relationships—clients      
Business Acquisition [Line Items]      
Estimated fair value 0    
Other | Developed technology      
Business Acquisition [Line Items]      
Estimated fair value $ 1,550    
Estimated useful life in years 4 years    
Other | Tradename      
Business Acquisition [Line Items]      
Estimated fair value $ 320    
Estimated useful life in years 2 years    
Other | Customer relationships—users      
Business Acquisition [Line Items]      
Estimated fair value $ 940    
Estimated useful life in years 2 years