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The Company and Significant Accounting Policies - Additional Information (Detail) $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2024 Segment	Mar. 17, 2023 USD ($)	Mar. 16, 2023	Nov. 30, 2017 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) Station shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($)
Accounting Policies [Line Items]
Number of operating segments | Segment	2
Restricted cash							$ 783	$ 765	$ 783	$ 765	$ 770
Retransmission consent revenue							$ 8,000	$ 8,900	$ 26,000	$ 27,900
Shares of dilutive securities not included in computation of diluted earnings per share | shares							1,141,172	1,893,154	1,092,389	2,031,593
Prepayment of credit facility					$ 10,000	$ 10,000
Financial covenants to net leverage ratio									3.25%
Interest coverage ratio to minimum permitted ratio									3.00%
Gain (loss) on debt extinguishment									$ (91)	$ (1,556)
Unamortized debt issuance costs							$ 848		848		$ 1,116
Customer Concentration Risk | Meta Platforms | Revenue
Accounting Policies [Line Items]
Concentration risk percentage											53.00%
TelevisaUnivision
Accounting Policies [Line Items]
Payment of sales representation fees to television stations							2,600	$ 1,500	5,600	4,500
Retransmission consent revenue							$ 5,700	$ 6,200	$ 18,200	$ 19,300
Common stock percentage held by Univision							10.00%		10.00%
Related Parties
Accounting Policies [Line Items]
Amount due from television stations for carriage							$ 5,500		$ 5,500
Term Loan A Facility
Accounting Policies [Line Items]
Principal payment					$ 4,900	8,750
Revolving Credit Facility
Accounting Policies [Line Items]
Line of Credit						$ 1,250
2017 Credit Facility
Accounting Policies [Line Items]
Agreement date				Nov. 30, 2017
Gain (loss) on debt extinguishment		$ (1,600)
Write-off of unamortized debt issuance costs		$ 1,100
2017 Credit Facility | Eurodollar Rate
Accounting Policies [Line Items]
Variable interest rate basis spread on debt				2.75%
2017 Credit Facility | Base Rate Margin
Accounting Policies [Line Items]
Variable interest rate basis spread on debt				1.75%
2017 Credit Facility | Term Loan B Facility
Accounting Policies [Line Items]
Senior Secured debt				$ 300,000
Interest rate			7.38%
Maturity date of revolving credit facility				Nov. 30, 2024
2023 Credit Facility
Accounting Policies [Line Items]
Agreement date		Mar. 17, 2023
Additional borrowing capacity		$ 100,000
First lien net leverage ratio		2.25%
Maturity date of revolving credit facility		Mar. 17, 2028
Debt issuance costs		$ 1,800
Gain (loss) on debt extinguishment							(100)		$ (100)
2023 Credit Facility | Term Loan A Facility
Accounting Policies [Line Items]
Senior Secured debt		200,000
Interest rate									7.70%
Unamortized debt issuance costs							800		$ 800
Estimated fair value of term loan							$ 176,700		$ 176,700
2023 Credit Facility | Revolving Credit Facility
Accounting Policies [Line Items]
Senior Secured debt		75,000
Amount drawn		$ 11,500
Interest rate									7.70%
Minimum | 2023 Credit Facility | Base Rate Margin
Accounting Policies [Line Items]
Variable interest rate basis spread on debt		1.50%
Minimum | 2023 Credit Facility | SOFR
Accounting Policies [Line Items]
Variable interest rate basis spread on debt		2.50%
Minimum | 2023 Credit Facility | Revolving Credit Facility
Accounting Policies [Line Items]
Interest rate		0.30%
Maximum | 2023 Credit Facility | Base Rate Margin
Accounting Policies [Line Items]
Variable interest rate basis spread on debt		2.00%
Maximum | 2023 Credit Facility | SOFR
Accounting Policies [Line Items]
Variable interest rate basis spread on debt		3.00%
Maximum | 2023 Credit Facility | Revolving Credit Facility
Accounting Policies [Line Items]
Interest rate		0.40%
Television
Accounting Policies [Line Items]
Number of stations owned | Station									49
Radio
Accounting Policies [Line Items]
Number of stations owned | Station									44

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