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Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Intangible Assets Net Excluding Goodwill [Line Items]    
Amortized intangible assets, Gross Carrying Amount $ 76,897 $ 75,361
Amortized intangible assets, Accumulated Amortization (59,356) (58,755)
Amortized intangible assets, Net Carrying Amount 17,541 16,606
Total intangible assets, Gross Carrying amount 109,180 107,644
Total intangible assets, Net Carrying Amount 49,824 48,889
FCC Licenses [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Total unamortized intangible assets, Gross Carrying Amount 32,283 32,283
Total unamortized intangible assets, Net Carrying Amount $ 32,283 32,283
Software [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 6 years 6 months  
Amortized intangible assets, Gross Carrying Amount $ 61,468 59,932
Amortized intangible assets, Accumulated Amortization (44,551) (43,950)
Amortized intangible assets, Net Carrying Amount $ 16,917 15,982
Other Intangible Assets [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 8 years  
Amortized intangible assets, Gross Carrying Amount $ 624 624
Amortized intangible assets, Net Carrying Amount 624 624
Service Customer Relationships [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Amortized intangible assets, Gross Carrying Amount 8,081 8,081
Amortized intangible assets, Accumulated Amortization (8,081) (8,081)
OEM and Dealer Relationships [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Amortized intangible assets, Gross Carrying Amount 6,724 6,724
Amortized intangible assets, Accumulated Amortization $ (6,724) $ (6,724)