Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands						3 Months Ended								12 Months Ended
	Oct. 13, 2020	Jan. 22, 2020	Nov. 07, 2019	Jun. 11, 2018	Jan. 16, 2018	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Total net revenue						$ 171,683	$ 62,978	$ 45,116	$ 64,249	$ 70,838	$ 68,816	$ 69,241	$ 64,680	$ 344,026	$ 273,575	$ 297,815
Other operating gain														6,895	$ 5,994	1,187
KMCC-TV | I O N Media Stations Inc
Business Acquisition [Line Items]
Consideration from sale of television station		$ 4,000
Discontinued operation, description		April 2, 2020, the Company sold KMCC-TV to ION Media Stations, Inc. for $4.0 million.
Other operating gain														$ 600
Cisneros Interactive
Business Acquisition [Line Items]
Noncontrolling interest	49.00%
Cisneros Interactive
Business Acquisition [Line Items]
Ownership Interest acquired	51.00%
Business acquisition date	Oct. 13, 2020
Aggregate cash consideration	$ 29,900
Business acquisition description of acquired entity														Subject to the terms of the Put and Call Agreement, if certain minimum EBITDA targets are met, the Sellers have the right (the “Put Option”), between March 15, 2024 and June 13, 2024, to cause the Company to purchase all (but not less than all) of the remaining 49% of the issued and outstanding shares of Cisneros Interactive at a purchase price to be based on a pre-determined multiple of six times Cisneros Interactive’s 12-month EBITDA in the preceding calendar year. The sellers may also exercise the Put Option upon the occurrence of certain events, between March 2022 and April 2024.
Accounts receivables assets acquired, fair value	50,500
Gross amount account receivables asset acquired	54,000
Amount due under contract expected to be uncollectible	3,500
Total net revenue														$ 89,200
Net income (loss)														5,100
Redeemable noncontrolling interest	30,800
Acquisition fees and costs														$ 900
Cash acquired	$ 8,700
Cisneros Interactive | Put Option
Business Acquisition [Line Items]
Agreed future ownership Interest acquired	49.00%
Cisneros Interactive | Call Option
Business Acquisition [Line Items]
Agreed future ownership Interest acquired	49.00%
Business acquisition description of acquired entity														Additionally, subject to the terms of the Put and Call Agreement, the Company has the right (the “Call Option”), in calendar year 2024, to purchase all (but not less than all) of the remaining 49% of the issued and outstanding shares of Cisneros Interactive at a purchase price to be based on a pre-determined multiple of six times of Cisneros Interactive’s 12-month EBITDA in calendar year 2023.
KMBH-TV
Business Acquisition [Line Items]
Business acquisition date			Nov. 07, 2019
Aggregate cash consideration			$ 2,900
Business acquisition description of acquired entity														the Company completed the acquisition of television station KMBH-TV, serving the McAllen, Texas area
KMBH-TV | Intangible Assets Not Subject to Amortization
Business Acquisition [Line Items]
Asset acquired			$ 2,300
Smadex
Business Acquisition [Line Items]
Ownership Interest acquired				100.00%
Business acquisition date				Jun. 11, 2018
Aggregate cash consideration				$ 3,500
Accounts receivables assets acquired, fair value				900
Gross amount account receivables asset acquired				900
Total net revenue																6,400
Acquisition fees and costs																400
Cash acquired				$ 1,200
Expenses																$ 5,800
KMCC-TV
Business Acquisition [Line Items]
Business acquisition date					Jan. 16, 2018
Aggregate cash consideration					$ 3,600
Business acquisition description of acquired entity														the Company completed the acquisition of television station KMCC-TV, which serves the Las Vegas, Nevada area	the Company completed the acquisition of television station KMCC-TV, which serves the Las Vegas, Nevada area