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Subsequent Events - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Nov. 01, 2018
Oct. 29, 2018
Oct. 26, 2018
Oct. 25, 2018
Oct. 01, 2018
Aug. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Subsequent Event [Line Items]                        
Repayment of debt                   $ 327,489,000 $ 1,891,750,000  
Dividends declared per common share             $ 0.375 $ 0.30   $ 1.125 $ 0.90  
Debt             $ 4,148,011,000     $ 4,148,011,000   $ 4,362,460,000
KRBK [Member]                        
Subsequent Event [Line Items]                        
Cash paid in business acquisition           $ 15,099,000            
Line of Credit                        
Subsequent Event [Line Items]                        
Repayment of debt                 $ 44,000,000.0      
Debt             5,628,000     5,628,000   3,000,000
Subsequent Event [Member] | KRBK [Member]                        
Subsequent Event [Line Items]                        
Cash paid in business acquisition $ 2,500,000                      
Subsequent Event [Member] | Nexstar [Member] | Line of Credit                        
Subsequent Event [Line Items]                        
Credit facilities outstanding principal balances     $ 0                  
Maximum borrowing capacity     163,400,000                  
Subsequent Event [Member] | Mission [Member] | Line of Credit                        
Subsequent Event [Line Items]                        
Credit facilities outstanding principal balances     0                  
Maximum borrowing capacity     $ 3,000,000.0                  
Debt instrument maturity date     Oct. 26, 2023 Jul. 19, 2022                
Basis points     0.25%                  
Subsequent Event [Member] | Class A Common Stock [Member]                        
Subsequent Event [Line Items]                        
Dividends declared per common share       $ 0.375                
Dividends, date declared       Oct. 25, 2018                
Dividends, date payable       Nov. 30, 2018                
Dividends, date of record       Nov. 16, 2018                
Term Loans [Member]                        
Subsequent Event [Line Items]                        
Repayment of debt             135,000,000.0     195,000,000.0    
Term Loans [Member] | Notes Payable to Banks [Member]                        
Subsequent Event [Line Items]                        
Repayment of debt                   31,100,000    
Debt             $ 2,574,596,000     $ 2,574,596,000   $ 2,791,875,000
Term Loans [Member] | Subsequent Event [Member]                        
Subsequent Event [Line Items]                        
Repayment of debt   $ 70,000,000.0     $ 55,000,000.0              
Term Loans B [Member] | Subsequent Event [Member] | Nexstar [Member] | Notes Payable to Banks [Member]                        
Subsequent Event [Line Items]                        
Repayment of debt     $ 150,000,000.0                  
Debt     $ 1,579,000,000                  
Debt instrument maturity date     Jan. 17, 2024                  
Basis points     0.25%                  
Term Loans B [Member] | Subsequent Event [Member] | Mission [Member] | Notes Payable to Banks [Member]                        
Subsequent Event [Line Items]                        
Debt     $ 228,500,000                  
Debt instrument maturity date     Jan. 17, 2024                  
Basis points     0.25%                  
Term Loans A [Member] | Subsequent Event [Member] | Shield Media, LLC [Member]                        
Subsequent Event [Line Items]                        
Basis points     0.25%                  
Term Loans A [Member] | Subsequent Event [Member] | Shield Media, LLC [Member] | Notes Payable to Banks [Member]                        
Subsequent Event [Line Items]                        
Credit facilities outstanding principal balances     $ 23,000,000.0                  
Debt instrument maturity date     Oct. 26, 2023 Jul. 19, 2022                
Term Loans A [Member] | Subsequent Event [Member] | Nexstar [Member]                        
Subsequent Event [Line Items]                        
Debt     $ 679,500,000                  
Debt instrument maturity date     Oct. 26, 2023 Jul. 19, 2022                
Basis points     0.25%                  
Borrowings from credit facility     $ 150,000,000.0