Intangible Assets and Goodwill - Additional Information (Detail)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Segment
$ / shares
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Intangible Assets And Goodwill [Line Items]      
Amortization expense $ 69,110,000 $ 79,981,000 $ 86,700,000
Impairment losses 549,711,000 0  
Impairment $ 15,873,000    
Asset impairment charges   $ 0  
Number of reporting units | Segment 3    
Market capitalization value $ 2,500,000,000    
Shares outstanding | shares 234.6    
Debt including preferred equity $ 2,400,000,000    
Broadcast licenses      
Intangible Assets And Goodwill [Line Items]      
Impairment $ 15,900,000    
Class A Common Stock      
Intangible Assets And Goodwill [Line Items]      
Closing price of stock | $ / shares $ 0.33    
Discounted cash flow valuation model | FCC Licenses      
Intangible Assets And Goodwill [Line Items]      
Market revenue growth rate percentage for the residual year 1.90%    
Discount rate in fair value calculations 8.60%    
Total term 3 years    
Period for calculating depreciation expense using accelerated double declining balance guidelines 5 years    
Goodwill | Discounted cash flow valuation model      
Intangible Assets And Goodwill [Line Items]      
Period for operating cash flow projections 5 years    
Market revenue growth rate percentage for the residual year 1.90%    
Estimated EBITDA multiple 10    
Discount rate in fair value calculations 8.60%