Quarterly report pursuant to Section 13 or 15(d)

Broadcast Licenses - Fair Value Measurement Inputs and Valuation Techniques for Broadcast Licenses (Detail)

v3.20.2
Broadcast Licenses - Fair Value Measurement Inputs and Valuation Techniques for Broadcast Licenses (Detail) - Broadcast Licenses [Member]
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Measurement Input, Risk-adjusted Discount Rate [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible asset measurement input percentage 8.5 9.5 9.0
Minimum [Member] | Measurement Input, Operating Profit Margin [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible asset measurement input percentage 4.3 4.6 4.0
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible asset measurement input percentage 0.2 0.8 0.7
Maximum [Member] | Measurement Input, Operating Profit Margin [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible asset measurement input percentage 33.3 33.8 33.8
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Intangible asset measurement input percentage 1.1 1.1 1.1