Other Matters - Narrative (Details) television_home in Millions				1 Months Ended	3 Months Ended	6 Months Ended	7 Months Ended	96 Months Ended
	Jun. 18, 2019 USD ($)	Jun. 11, 2019 USD ($)	Mar. 20, 2019 USD ($) affiliate market station	Apr. 30, 2017 USD ($) phase station	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) television_home market	Aug. 06, 2019 USD ($)	Jun. 30, 2019 market	Mar. 23, 2018 USD ($)
Business Acquisition [Line Items]
Number of stations assigned new channels | station				13
Authorized reimbursement amount				$ 1,750,000,000
Authorized reimbursement amount, repacking fund									$ 1,000,000,000
Authorized reimbursement amount, repacking fund, full power, class a stations and multichannel distributors									$ 750,000,000
Repacking period				39 months
Number of repacking phases | phase				10
Capital expenditures incurred						$ 6,200,000
FCC reimbursements received						15,800,000
Amounts reimbursed as a percentage of total costs				92.50%
Severance charges					$ 7,300,000	$ 3,000,000.0
Growth percentage of number of viewers								48.00%
Number of television homes | television_home						87
Number of markets In which entity operates | market						41		41
Justice Network And Quest
Business Acquisition [Line Items]
Consideration transferred	$ 77,200,000
Ownership interest (as a percent)	85.00%					85.00%		85.00%
Nexstar Media Group, Television Stations
Business Acquisition [Line Items]
Consideration transferred			$ 740,000,000
Number of television stations acquired | station			11
Number of markets In which entity operates | market			8
Number of Big Four affiliates | affiliate			8
Number of markets in which an entity operates, additions | market			4
WTHR and WBNS, Television Stations
Business Acquisition [Line Items]
Consideration transferred		$ 535,000,000
Subsequent Event
Business Acquisition [Line Items]
Capital expenditures incurred							$ 23,700,000