The Company and Significant Accounting Policies - Additional Information (Detail)				1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended	19 Months Ended
	Mar. 17, 2023 USD ($)	Mar. 16, 2023	Nov. 30, 2017 USD ($)	Jul. 31, 2023 USD ($) Days $ / shares	Sep. 30, 2023 USD ($) Advertiser AdvertisingCustomer Country Unit Market $ / shares shares	Sep. 30, 2022 USD ($) shares	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) Segment Market Station Advertiser AdvertisingCustomer Country Unit $ / shares shares	Sep. 30, 2022 USD ($) shares	Dec. 31, 2022 USD ($) Advertiser	Sep. 30, 2023 USD ($) Advertiser AdvertisingCustomer Country Unit Market $ / shares shares	May 19, 2023 USD ($)	Apr. 03, 2023	Mar. 01, 2022 USD ($)
Accounting Policies [Line Items]
Number of reportable segments | Segment									3
Number of business units | Unit					4				4			4
Sales Operations in Number of Countries | Country					40				40			40
Restricted cash					$ 765,000	$ 751,000			$ 765,000	$ 751,000	$ 753,000	$ 765,000
Retransmission consent revenue					$ 8,900,000	$ 8,900,000			$ 27,900,000	$ 27,200,000
Number of Class A common stock shares converted | shares									1
Shares of dilutive securities not included in computation of diluted earnings per share | shares					551,378	4,052			932,230	34,388
Impairment charges related to intangible subject to amortization					$ 1,000,000				$ 1,000,000
Amount approved under share purchase															$ 20,000,000
Aggregate purchase price of repurchased shares							$ 4,138,000	$ 7,142,000
Gain (loss) on debt extinguishment									(1,556,000)
Unamortized debt issuance costs					$ 1,180,000				$ 1,180,000		$ 1,221,000	$ 1,180,000
Number of advertisers represent more than five percent of trade receivables | Advertiser					0				0			0
Number of advertising customer represented more than five percent of revenue | AdvertisingCustomer					0				0			0
Estimated losses for bad debts					$ 300,000	$ 1,200,000			$ 2,000,000	$ 2,200,000
Bad debts actually charged off					1,000,000	1,300,000			1,300,000	1,800,000
Interest income related to available-for-sale securities					1,558,000	788,000			3,455,000	1,916,000
Assets held for sale					1,223,000				1,223,000			$ 1,223,000
Change in fair value of contingent consideration					(5,997,000)	734,000			(8,939,000)	6,810,000
Accounts Payable and Accrued Expenses
Accounting Policies [Line Items]
Contingent Liability, Current					8,200,000				8,200,000			8,200,000
Other Long-term Liabilities
Accounting Policies [Line Items]
Contingent Liability, Noncurrent					13,400,000				13,400,000			$ 13,400,000
TelevisaUnivision
Accounting Policies [Line Items]
Payment of sales representation fees to television stations					1,500,000	2,000,000			$ 4,500,000	5,400,000
Number of markets involved in sales and marketing | Market									3
Retransmission consent revenue					$ 6,200,000	$ 6,200,000			$ 19,300,000	$ 18,700,000
Common stock percentage held by Univision					11.00%				11.00%			11.00%
UniMas
Accounting Policies [Line Items]
Affiliate advertising minutes per hour for which entity has right to sell									4 minutes 30 seconds
Related Parties
Accounting Policies [Line Items]
Amount due from television stations for carriage					$ 10,300,000				$ 10,300,000			$ 10,300,000
Customer Concentration Risk | Revenue | Commercial Partner
Accounting Policies [Line Items]
Concentration risk percentage					54.00%	49.00%			53.00%	51.00%
Largest Advertisers | Customer Concentration Risk | Trade Receivables
Accounting Policies [Line Items]
Number of largest advertisers | Advertiser					5				5		5	5
Concentration risk percentage									5.00%		2.00%
Largest Advertisers | Customer Concentration Risk | Revenue
Accounting Policies [Line Items]
Concentration risk percentage					14.00%	11.00%			13.00%	13.00%
Cisneros Interactive
Accounting Policies [Line Items]
Remaining ownership interest acquired					49.00%				49.00%			49.00%
Fair value of contingent consideration recognized					$ 8,000,000				$ 8,000,000		$ 41,400,000	$ 8,000,000
Contingent Liability, Current					7,100,000				7,100,000		30,000,000	7,100,000
Contingent Liability, Noncurrent					900,000				900,000		11,400,000	$ 900,000
Change in fair value of contingent consideration					$ 0	$ 5,900,000			$ 5,800,000	$ 6,900,000
MediaDonuts
Accounting Policies [Line Items]
Ownership interest acquired					100.00%				100.00%			100.00%
Fair value of contingent consideration recognized					$ 11,600,000				$ 11,600,000		22,200,000	$ 11,600,000
Contingent Liability, Current											6,500,000
Contingent Liability, Noncurrent											15,700,000
Change in fair value of contingent consideration					$ 5,900,000	2,000,000			$ 3,700,000	1,300,000
365 Digital
Accounting Policies [Line Items]
Ownership interest acquired					100.00%				100.00%			100.00%
Fair value of contingent consideration recognized					$ 0				$ 0		200,000	$ 0
Contingent Liability, Noncurrent											$ 200,000
Change in fair value of contingent consideration					$ 200,000	3,200,000			$ 500,000	1,400,000
Adsmurai Acquisition
Accounting Policies [Line Items]
Ownership interest acquired														51.00%
Jack of Digital Acquisition
Accounting Policies [Line Items]
Ownership interest acquired					85.00%				85.00%			85.00%
Fair value of contingent consideration recognized					$ 300,000				$ 300,000			$ 300,000
Contingent Liability, Noncurrent					$ 300,000				$ 300,000			$ 300,000
BCNMonetize
Accounting Policies [Line Items]
Ownership interest acquired					100.00%				100.00%			100.00%	100.00%
Fair value of contingent consideration recognized					$ 1,700,000				$ 1,700,000			$ 1,700,000	$ 1,600,000
Contingent Liability, Current					1,100,000				1,100,000			1,100,000
Contingent Liability, Noncurrent					600,000				600,000			600,000
Change in fair value of contingent consideration					100,000				100,000
Phoenix Market
Accounting Policies [Line Items]
Agreement amount to sell building									2,500,000
Assets held for sale					900,000				900,000			900,000
Boston Market
Accounting Policies [Line Items]
Agreement amount to sell building									1,300,000
Assets held for sale					300,000				300,000			300,000
Available-for-Sale Securities
Accounting Policies [Line Items]
Interest income related to available-for-sale securities					200,000	600,000			$ 1,000,000	1,700,000
2017 Credit Facility
Accounting Policies [Line Items]
Agreement date			Nov. 30, 2017
Gain (loss) on debt extinguishment	$ (1,600,000)
Write-off of unamortized debt issuance costs	$ 1,100,000
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			$ 300,000,000
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	$ 100,000,000
First lien net leverage ratio	2.25%
Maturity date of revolving credit facility	Mar. 17, 2028
Debt issuance costs	$ 1,800,000
Certain customary events of default, number of business days to default in the payment of interest on borrowings									3 days
Certain customary events of default, number of business days to default in the payment of any other amounts									5 days
Certain customary events of default, number of days default continue for compliance with other agreement									30 days
Certain customary events of default, number of days default continue for financial statement delivery obligations									10 days
Certain customary events of default, indebtedness aggregate amount									$ 15,000,000
Certain customary events of default, failure in payment of final judgments aggregate amount									$ 15,000,000
Certain customary events of default, failure in payment of final judgments aggregate amount period									30 days
2023 Credit Facility | Term Loan A Facility
Accounting Policies [Line Items]
Senior Secured debt	200,000,000
Interest rate									8.16%
Unamortized debt issuance costs					1,200,000				$ 1,200,000			1,200,000
Estimated fair value of term loan					$ 196,300,000				$ 196,300,000			$ 196,300,000
2023 Credit Facility | Revolving Credit Facility
Accounting Policies [Line Items]
Senior Secured debt	75,000,000
Amount drawn	$ 11,500,000
Interest rate									8.16%
Class A common stock
Accounting Policies [Line Items]
Number of shares repurchased | shares					0				0			1,800,000
Aggregate purchase price of repurchased shares									$ 11,300,000
Average price of repurchased shares | $ / shares									$ 6.43
Restricted Stock Units
Accounting Policies [Line Items]
Share-based compensation expenses					$ 6,700,000	2,800,000			$ 16,700,000	8,000,000
Total unrecognized compensation expense related to grants of restricted stock units					$ 22,900,000				$ 22,900,000			$ 22,900,000
Weighted average period for unrecognized compensation expense related to grants of restricted stock units									1 year 9 months 18 days
Performance Stock Units
Accounting Policies [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares					1,000,000				1,000,000			1,000,000
Allocated percentage									20.00%
Share price | $ / shares					$ 4.39				$ 4.39			$ 4.39
Number of consecutive trading days | Days				30
Performance period commencing date				Jul. 01, 2023
Performance period ending date				Jul. 01, 2028
Granted, weighted average grant date fair value (in dollars per share) | $ / shares									$ 3.29
Share-based compensation expenses					$ 300,000	$ 0			$ 300,000	$ 0
Percentage of performance measurement									100.00%
Total unrecognized compensation expense related to grants of restricted stock units					$ 2,900,000				$ 2,900,000			$ 2,900,000
Weighted average period for unrecognized compensation expense related to grants of restricted stock units									2 years 9 months 18 days
Performance Stock Units | Tranche One
Accounting Policies [Line Items]
Share price | $ / shares				$ 5.75
Fair value of each of the Tranches				$ 800,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares				$ 3.98
Performance Stock Units | Tranche Two
Accounting Policies [Line Items]
Share price | $ / shares				$ 7.25
Fair value of each of the Tranches				$ 700,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares				$ 3.64
Performance Stock Units | Tranche Three
Accounting Policies [Line Items]
Share price | $ / shares				$ 9
Fair value of each of the Tranches				$ 700,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares				$ 3.31
Performance Stock Units | Tranche Four
Accounting Policies [Line Items]
Share price | $ / shares				$ 11.2
Fair value of each of the Tranches				$ 600,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares				$ 2.93
Performance Stock Units | Tranche Five
Accounting Policies [Line Items]
Share price | $ / shares				$ 13.75
Fair value of each of the Tranches				$ 500,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares				$ 2.58
Minimum | TelevisaUnivision
Accounting Policies [Line Items]
Affiliate advertising minutes per hour for which entity has right to sell									4 minutes
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%
Minimum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period									1 year
Minimum | Performance Stock Units
Accounting Policies [Line Items]
Vesting percentage				0.00%
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%
Maximum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period									4 years
Maximum | Performance Stock Units
Accounting Policies [Line Items]
Vesting percentage				100.00%
Television
Accounting Policies [Line Items]
Number of stations owned | Station									49
Radio
Accounting Policies [Line Items]
Number of stations owned | Station									45
Number of markets operated | Market					14				14			14
Advertisements and Syndicate Radio Programming | Minimum
Accounting Policies [Line Items]
Number of markets owned | Market									100