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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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