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Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Intangible Assets Net Excluding Goodwill [Line Items]    
Total intangible assets, Gross Carrying Amount $ 189,406 $ 167,424
Amortized intangible assets, Gross Carrying Amount 157,123 135,141
Amortized intangible assets, Accumulated Amortization (98,745) (82,249)
Amortized intangible assets, Net Carrying Amount 58,378 52,892
Total intangible assets, Net Carrying Amount 90,661 85,175
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) 2 years 2 months 12 days  
Amortized intangible assets, Gross Carrying Amount $ 140,818 118,836
Amortized intangible assets, Accumulated Amortization (85,490) (70,127)
Amortized intangible assets, Net Carrying Amount $ 55,328 48,709
Service Customer Relationships [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 2 years 6 months  
Amortized intangible assets, Gross Carrying Amount $ 8,081 8,081
Amortized intangible assets, Accumulated Amortization (5,534) (4,773)
Amortized intangible assets, Net Carrying Amount $ 2,547 3,308
Other Intangible Assets [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 1 year 3 months 19 days  
Amortized intangible assets, Gross Carrying Amount $ 1,500 1,500
Amortized intangible assets, Accumulated Amortization (997) (682)
Amortized intangible assets, Net Carrying Amount 503 818
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) (6,667)
Amortized intangible assets, Net Carrying Amount   $ 57