The Company and Significant Accounting Policies - Additional Information (Detail)			3 Months Ended		12 Months Ended
	Jun. 04, 2021 USD ($)	Nov. 30, 2017 USD ($)	Mar. 31, 2022 USD ($) Advertiser Market Unit Station AdvertisingCustomer Country $ / shares shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($) Advertiser Segment	Mar. 01, 2022 USD ($)	Sep. 01, 2021
Accounting Policies [Line Items]
Number of reportable segments | Segment					3
Number of business units | Unit			4
Sales Operations in Number of Countries | Country			30
Percentage of defer the employer portion of social security payroll tax of CARES act			6.20%
Percentage of deferred employer portion of social security payroll tax of CARES act					50.00%
Percentage of deferred amount of social security payroll tax of CARES act					50.00%
Restricted cash			$ 749,000	$ 749,000	$ 749,000
Amount due from television stations for carriage			4,400,000
Retransmission consent revenue			$ 9,200,000	$ 9,600,000
Number of Class A common stock shares converted | shares			1
Shares of dilutive securities not included in computation of diluted earnings per share | shares			17,411	0
Impairment charge				$ 1,326,000
Amount approved under share purchase						$ 20,000,000
Aggregate purchase price of repurchased shares			7,142,000
Unamortized debt issuance costs			$ 1,684,000		1,851,000
Number of advertisers represent more than five percent of trade receivables | Advertiser			0
Number of advertising customer represented more than five percent of revenue | AdvertisingCustomer			0
Estimated losses for bad debts			$ 100,000	1,100,000
Bad debts actually charged off			100,000	100,000
Interest income related to available-for-sale securities			406,000	140,000
Other operating gain			119,000	$ 1,913,000
Assets held for sale			1,963,000		1,963,000
Fair value of assets			$ 861,609,000		$ 851,342,000
Customer Concentration Risk | Revenue | Commercial Partner
Accounting Policies [Line Items]
Concentration risk percentage			53.00%	56.00%
Largest Advertisers | Customer Concentration Risk | Trade Receivables
Accounting Policies [Line Items]
Number of largest advertisers | Advertiser			5		5
Concentration risk percentage			4.00%		3.00%
Largest Advertisers | Customer Concentration Risk | Revenue
Accounting Policies [Line Items]
Concentration risk percentage			18.00%	10.00%
Cisneros Interactive
Accounting Policies [Line Items]
Remaining ownership interest acquired			49.00%				49.00%
Laredo, Texas
Accounting Policies [Line Items]
Agreement amount to sell building			$ 2,700,000
Assets held for sale			2,000,000.0
Available-for-Sale Securities
Accounting Policies [Line Items]
Interest income related to available-for-sale securities			$ 400,000	$ 100,000
2017 Credit Facility
Accounting Policies [Line Items]
Agreement date		Nov. 30, 2017
Additional borrowing capacity		$ 100,000,000.0
First lien net leverage ratio		4.00%
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 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			$ 15,000,000.0
Certain customary events of default, failure in payment of final judgments aggregate amount			$ 15,000,000.0
Certain customary events of default, failure in payment of final judgments aggregate amount period			30 days
Percentage of fee equal to amount of outstanding loans	0.375%
Fee amount	$ 600,000
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		$ 300,000,000.0
Maturity date of revolving credit facility		Nov. 30, 2024
Carrying value of term loan			$ 209,800,000
Unamortized debt issuance costs			1,700,000
Estimated fair value of term loan			$ 205,200,000
Class A common stock
Accounting Policies [Line Items]
Number of shares repurchased | shares			1,100,000
Aggregate purchase price of repurchased shares			$ 7,100,000
Average price of repurchased shares | $ / shares			$ 6.41
Stock Options And Restricted Stock Units
Accounting Policies [Line Items]
Share-based compensation expenses			$ 2,600,000	1,100,000
Employee Stock Options
Accounting Policies [Line Items]
Share-based compensation expenses			0	0
Restricted Stock Units
Accounting Policies [Line Items]
Total unrecognized compensation expense related to grants of restricted stock units			$ 12,300,000
Weighted average period for unrecognized compensation expense related to grants of restricted stock units			1 year 8 months 12 days
Univision
Accounting Policies [Line Items]
Payment of sales representation fees to television stations			$ 1,600,000	1,900,000
Number of markets involved in sales and marketing | Market			3
Retransmission consent revenue			$ 6,300,000	$ 6,700,000
Common stock percentage held by Univision			11.00%
UniMas
Accounting Policies [Line Items]
Affiliate advertising minutes per hour for which entity has right to sell			4 minutes 30 seconds
Minimum | Employee Stock Options
Accounting Policies [Line Items]
Vesting period			1 year
Minimum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period			1 year
Minimum | TelevisaUnivision
Accounting Policies [Line Items]
Affiliate advertising minutes per hour for which entity has right to sell			4 minutes
Maximum
Accounting Policies [Line Items]
Terminated stock repurchase program amount						$ 45,000,000
Maximum | Employee Stock Options
Accounting Policies [Line Items]
Vesting period			4 years
Maximum | Restricted Stock Units
Accounting Policies [Line Items]
Vesting period			4 years
Television
Accounting Policies [Line Items]
Number of stations owned | Station			49
Fair value of assets			$ 425,867,000		$ 433,303,000
Radio
Accounting Policies [Line Items]
Number of stations owned | Station			46
Number of markets operated | Market			14
Advertisements and Syndicate Radio Programming | Minimum
Accounting Policies [Line Items]
Number of markets owned | Market			100
Digital
Accounting Policies [Line Items]
Fair value of assets			$ 330,204,000		$ 309,347,000