FCC Regulatory Matters - Additional Information (Details)				1 Months Ended	3 Months Ended					9 Months Ended
	Dec. 06, 2019 USD ($)	Jul. 21, 2017 USD ($)	Apr. 13, 2017 USD ($) TelevisionStation	Nov. 30, 2017 TelevisionStation	Sep. 30, 2020 USD ($) TelevisionStation	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2020 USD ($) TelevisionStation	Sep. 30, 2019 USD ($)	Mar. 31, 2020 TelevisionStation
FCC Regulatory Matters [Line Items]
Number of voices test local television ownership					8					8
Maximum percentage of US television household reach					39.00%					39.00%
Percentage reach of ultra high frequency station					50.00%					50.00%
Effective date of reinstating the ultra high frequency discount										Jun. 15, 2017
Date of abolishing the UHF discount										Aug. 24, 2016
Number of stations owned			11
Number of stations to move to very high frequency channels												1
Number of stations went off the air				1
Number of remaining stations owned before ceased					10					10
Number of ceased broadcasting channels					8					8
Non-cash gain on relinquishment of spectrum | $										$ 10,791,000
Maximum amount allocated by Congress for reimbursement of repack costs industry-wide | $										2,750,000,000
Excess over maximum amount allocated by Congress for reimbursement of repack costs industry-wide | $	$ 2,180,000,000
Capital expenditures related to station repack | $					$ 19,400,000		$ 19,900,000			49,300,000	$ 56,300,000
Reimbursement from the FCC related to station repack | $					$ 12,873,000		$ 20,417,000			$ 51,347,000	$ 54,020,000
Nexstar [Member]
FCC Regulatory Matters [Line Items]
Number of full power stations repacked					61					61
Consolidated VIEs [Member]
FCC Regulatory Matters [Line Items]
Number of full power stations repacked					17					17
Media General [Member]
FCC Regulatory Matters [Line Items]
Number of stations owned			10
Number of stations owned				1
Gross proceeds to surrender of spectrum auction | $		$ 478,600,000
Derecognition of spectrum asset to surrender spectrum | $			$ 52,000,000.0			$ 67,200,000		$ 314,100,000	$ 34,600,000
Derecognition of spectrum liability to surrender spectrum | $			$ 52,000,000.0			$ 78,000,000.0		$ 314,100,000	$ 34,600,000
Non-cash gain on relinquishment of spectrum | $										$ 10,800,000