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FCC Regulatory Matters - Additional Information (Details)
1 Months Ended 12 Months Ended
Jan. 04, 2021
USD ($)
Jul. 21, 2017
USD ($)
Apr. 13, 2017
TelevisionStation
Apr. 30, 2020
USD ($)
TelevisionStation
Nov. 30, 2017
TelevisionStation
Dec. 31, 2020
USD ($)
TelevisionStation
Dec. 31, 2019
USD ($)
TelevisionStation
Dec. 31, 2018
USD ($)
TelevisionStation
Dec. 31, 2017
USD ($)
TelevisionStation
Jan. 07, 2021
TelevisionStation
FCC Regulatory Matters [Line Items]                    
Number of voices test local television ownership | TelevisionStation           8        
Maximum percentage of US television household reach           39.00%        
Percentage reach of ultra high frequency station           50.00%        
Effective date of reinstating the ultra high frequency discount           Jun. 15, 2017        
Date of abolishing the UHF discount           Aug. 24, 2016        
Number of stations went off the air | TelevisionStation                 1  
Number of ceased broadcasting channels | TelevisionStation               8    
Asset and (liability) surrender value               $ 314,100,000    
Number of stations to move to very high frequency channels | TelevisionStation       1     1      
Non-cash gain on relinquishment of spectrum           $ 10,791,000        
Maximum amount allocated by Congress for reimbursement of repack costs industry-wide           2,750,000,000        
Capital expenditures related to station repack           54,700,000 $ 79,300,000 26,800,000    
Reimbursement from the FCC related to station repack           $ 57,261,000 70,356,000 $ 29,381,000    
Subsequent Event [Member]                    
FCC Regulatory Matters [Line Items]                    
Excess over maximum amount allocated by Congress for reimbursement of repack costs industry-wide $ 2,190,000,000                  
Number of stations to convert from interim to permanent facility | TelevisionStation                   1
Nexstar [Member]                    
FCC Regulatory Matters [Line Items]                    
Number of full power stations repacked | TelevisionStation           61        
Consolidated VIEs [Member]                    
FCC Regulatory Matters [Line Items]                    
Number of full power stations repacked | TelevisionStation           17        
Media General [Member]                    
FCC Regulatory Matters [Line Items]                    
Number of stations owned | TelevisionStation     10              
Number of stations owned | TelevisionStation         1          
Gross proceeds to surrender of spectrum auction   $ 478,600,000                
Derecognition of spectrum asset to surrender spectrum       $ 67,200,000     52,000,000.0   $ 34,600,000  
Derecognition of spectrum liability to surrender spectrum       78,000,000.0     $ 52,000,000.0   $ 34,600,000  
Non-cash gain on relinquishment of spectrum       $ 10,800,000