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Other Matters - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
station
phase
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
FCC Broadcast Spectrum Program          
Number of stations assigned new channels | station     13    
Repacking period     39 months    
Number of repacking phases | phase     10    
FCC Broadcast Spectrum Program, authorized reimbursement amount   $ 1,750,000,000.00 $ 1,750,000,000.00    
Estimated aggregate costs     1,900,000,000    
Spectrum channel share agreement proceeds   32,600,000 $ 32,588,000 $ 0  
Deferred revenue, recognition period     20 years    
Voluntary Retirement Program (VRP)          
Restructuring Cost and Reserve [Line Items]          
Accrued separation liability   $ 400,000 $ 400,000    
Severance | Voluntary Retirement Program (VRP)          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges         $ 16,000,000
Subsequent Event          
FCC Broadcast Spectrum Program          
Reimbursements allocated from fund during period $ 1,000,000,000        
Amounts reimbursed as a percentage of total costs 52.00%