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FCC Licenses - Discounted Cash Flow Analyses (Detail)
 3 Months Ended
Jun. 30, 2022
Measurement Input, Discount Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 9.50%
Minimum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 0.60%
Operating income margins at maturity 19.20%
Minimum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate (1.90%)
Maximum [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Market revenue shares at maturity 44.00%
Operating income margins at maturity 32.60%
Maximum [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]  
Fair Value Inputs Asset Quantitative Information [Line Items]  
Fair value assumptions inputs rate 15.90%