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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Line Items]    
Estimated liabilities for unpaid claims $ 9.8 $ 10.6
Journal Media Group | Accounts receivable    
Summary of Significant Accounting Policies [Line Items]    
Estimated liabilities for unpaid claims $ 1.7  
Television network affiliation relationships    
Summary of Significant Accounting Policies [Line Items]    
Estimated useful life 20 years  
Customer lists and other intangible assets    
Summary of Significant Accounting Policies [Line Items]    
Estimated useful life 20 years  
FCC licenses | Maximum    
Summary of Significant Accounting Policies [Line Items]    
FCC license term 8 years  
Operating revenue | Marketing services, including advertising    
Summary of Significant Accounting Policies [Line Items]    
Concentration Risk, Percentage 65.00%