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Intangible Assets and Goodwill (Narrative) (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Intangible Assets And Goodwill [Line Items]        
Amortization expense, definite-lived   $ 33,505 $ 56,215 $ 69,100
Number of reporting units | segment   2    
Market revenue growth rate percentage for the residual year   (1.00%)    
Weighted average cost of capital   9.30%    
Goodwill   $ 135,214 135,214  
Period for calculating depreciation expense using accelerated double declining balance guidelines   5 years    
Westwood One        
Intangible Assets And Goodwill [Line Items]        
Amortization expense, definite-lived $ 1,800      
Goodwill   $ 135,214 135,214  
Goodwill Test 2        
Intangible Assets And Goodwill [Line Items]        
Noncash impairment charge     568,100  
Goodwill Test 2 | Reporting Unit 1        
Intangible Assets And Goodwill [Line Items]        
Goodwill     0  
FCC Licenses        
Intangible Assets And Goodwill [Line Items]        
Noncash impairment charge   $ 335,900 $ 35,000