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Retirement and Postretirement Plans - Summary of Components of Net Periodic Benefit Cost (Credit) for Plans (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Media General [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   $ 11,820 $ 15,517 $ 13,965
Expected return on plan assets   (19,700) (21,867) (25,534)
Amortization of net (gain) loss   30    
Net periodic benefit cost (credit)   (7,850) (6,350) (11,569)
Media General [Member] | OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   12 12 16
Interest cost   540 765 689
Amortization of prior service costs   (46)    
Amortization of net (gain) loss   162 (10) 109
Net periodic benefit cost (credit)   668 767 $ 814
Tribune [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Settlement gain recognized $ (1,600)      
Tribune [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost   962 271  
Interest cost   51,757 15,650  
Expected return on plan assets   (89,136) (25,708)  
Settlement gain recognized   (1,591)    
Net periodic benefit cost (credit)   (38,008) (9,787)  
Tribune [Member] | OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost   141 41  
Net periodic benefit cost (credit)   $ 141 $ 41