Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Trade and Barter Transactions Expenses (Detail)

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Basis of Presentation and Significant Accounting Policies - Trade and Barter Transactions Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Broadcast [Member]        
Revenue Recognition [Line Items]        
Advertising Barter Transactions, Advertising Barter Revenue $ 1,384 $ 1,580 $ 4,915 $ 4,105
Advertising Barter Transactions, Advertising Barter Costs 1,458 1,663 4,211 3,928
Digital Media [Member]        
Revenue Recognition [Line Items]        
Advertising Barter Transactions, Advertising Barter Revenue     93  
Advertising Barter Transactions, Advertising Barter Costs 3   3  
Publishing [Member]        
Revenue Recognition [Line Items]        
Advertising Barter Transactions, Advertising Barter Revenue 3 7 10 47
Advertising Barter Transactions, Advertising Barter Costs $ 7 $ 1 $ 9 $ 84