Annual report pursuant to Section 13 and 15(d)

Goodwill - Fair Value Measurement Inputs and Valuation Techniques For Goodwill (Detail)

v3.20.1
Goodwill - Fair Value Measurement Inputs and Valuation Techniques For Goodwill (Detail)
Dec. 31, 2019
Dec. 31, 2018
Measurement Input Risk Adjusted Discount Rate [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 1,000 1,000
Measurement Input Risk Adjusted Discount Rate [Member] | Publishing [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 1,000 1,000
Measurement Input Risk Adjusted Discount Rate [Member] | Radio Clusters [Member] | Broadcast Networks Enterprise Valuations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 900 900
Measurement Input, Long-term Revenue Growth Rate [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage   100
Measurement Input, Long-term Revenue Growth Rate [Member] | Publishing [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 50 100
Minimum [Member] | Measurement Input Operating Profit Margin [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 370 850
Minimum [Member] | Measurement Input Operating Profit Margin [Member] | Publishing [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 150 400
Minimum [Member] | Measurement Input Operating Profit Margin [Member] | Radio Clusters [Member] | Broadcast Networks Enterprise Valuations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 3,110 410
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 50  
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Radio Clusters [Member] | Broadcast Networks Enterprise Valuations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 70 50
Maximum [Member] | Measurement Input Operating Profit Margin [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 2,880 1,720
Maximum [Member] | Measurement Input Operating Profit Margin [Member] | Publishing [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 390 500
Maximum [Member] | Measurement Input Operating Profit Margin [Member] | Radio Clusters [Member] | Broadcast Networks Enterprise Valuations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 3,870 4,510
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Digital [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 100  
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Radio Clusters [Member] | Broadcast Networks Enterprise Valuations [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 90 110