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Retirement and Postretirement Plans - Additional Information (Details) - USD ($)
11 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]            
Other postretirement benefit plans changes in funded status amortization term       5 years    
Retirement savings plans Nexstar [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Contributions by employer       $ 8,500,000 $ 4,200,000 $ 1,600,000
Scenario, Forecast [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Net periodic benefit credit     $ 5,600,000      
OPEB [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Estimated amortization of net loss in 2019       46,000    
Prior service cost recognized in accumulated other comprehensive income       0    
Transition obligation recognized in accumulated other comprehensive income       0    
Net periodic benefit credit $ 717,000     $ 814,000    
Net periodic benefit costs, discount rate       3.42% 3.80%  
LIN’s Supplemental Retirement Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Net periodic benefit costs, discount rate       2.30%    
LIN’s Supplemental Retirement Plan [Member] | Scenario, Forecast [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Net periodic benefit costs, discount rate   4.00% 3.20%      
Minimum [Member] | U.S. Large Cap Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       3.00%    
Minimum [Member] | U.S. Small/Mid Cap Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       0.00%    
Minimum [Member] | International/Global Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       0.00%    
Minimum [Member] | Other Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       0.00%    
Minimum [Member] | Fixed Income [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       50.00%    
Minimum [Member] | Cash [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       0.00%    
Maximum [Member] | U.S. Large Cap Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       23.00%    
Maximum [Member] | U.S. Small/Mid Cap Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       13.00%    
Maximum [Member] | International/Global Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       19.00%    
Maximum [Member] | Other Equity [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       17.00%    
Maximum [Member] | Fixed Income [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       70.00%    
Maximum [Member] | Cash [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Target plan asset allocations range       10.00%    
Level 1 [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets 57,600,000     $ 49,200,000 $ 57,600,000  
Net Asset Value [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Fair value of plan assets $ 323,800,000     $ 281,700,000 $ 323,800,000