Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Broadcast Licenses - Fair Value Measurement Inputs and Valuation Techniques for Broadcast Licenses (Detail) - Broadcast Licenses [Member]
Dec. 31, 2018
Dec. 31, 2017
Measurement Input, Risk-adjusted Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 0.090 0.090
Measurement Input, Long-term Revenue Growth Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 0.012 0.019
Minimum [Member] | Measurement Input, Operating Profit Margin [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 0.044 (0.139)
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 0.005  
Maximum [Member] | Measurement Input, Operating Profit Margin [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Intangible asset measurement input percentage 0.345 0.308