Revenue - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Barter revenue amount	$ 40,726	$ 41,904
Revenue recognized	300
Variable consideration form agency based volume discounts accrued as contract liabilities within accrued expense	1,602		$ 991
Accrued Expenses
Disaggregation Of Revenue [Line Items]
Variable consideration form agency based volume discounts accrued as contract liabilities within accrued expense	2,300		$ 2,000
Barter
Disaggregation Of Revenue [Line Items]
Barter revenue amount	1,645	1,838
Barter expense amount	1,500	2,000
Revenue recognized	100
Local, National, Digital and Network
Disaggregation Of Revenue [Line Items]
Barter revenue amount	31,547	31,457
Revenue recognized	300
Special Events
Disaggregation Of Revenue [Line Items]
Barter revenue amount	6,429	$ 7,093
Revenue recognized	$ 200