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Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Intangible Assets Net Excluding Goodwill [Line Items]    
Amortized intangible assets, Gross Carrying Amount $ 64,877 $ 58,896
Amortized intangible assets, Accumulated Amortization (44,592) (39,996)
Amortized intangible assets, Net Carrying Amount 20,285 18,900
Total intangible assets, Gross Carrying amount 97,160 91,179
Total intangible assets, Net Carrying Amount 52,568 51,183
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) 3 years 4 months 24 days  
Amortized intangible assets, Gross Carrying Amount $ 48,572 42,591
Amortized intangible assets, Accumulated Amortization (29,787) (25,191)
Amortized intangible assets, Net Carrying Amount $ 18,785 17,400
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 $ 1,500 1,500
Amortized intangible assets, Net Carrying Amount 1,500 1,500
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)