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Intangible Assets - Schedule of Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Intangible Assets Net Excluding Goodwill [Line Items]    
Total intangible assets, Gross Carrying Amount $ 196,760 $ 193,651
Amortized intangible assets, Gross Carrying Amount 164,477 161,368
Amortized intangible assets, Accumulated Amortization (112,882) (107,138)
Amortized intangible assets, Net Carrying Amount 51,595 54,230
Total intangible assets, Net Carrying Amount 83,878 86,513
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 1 month 6 days  
Amortized intangible assets, Gross Carrying Amount $ 148,172 145,063
Amortized intangible assets, Accumulated Amortization (98,916) (93,523)
Amortized intangible assets, Net Carrying Amount $ 49,256 51,540
Service Customer Relationships [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 2 years  
Amortized intangible assets, Gross Carrying Amount $ 8,081 8,081
Amortized intangible assets, Accumulated Amortization (6,042) (5,788)
Amortized intangible assets, Net Carrying Amount $ 2,039 2,293
Other Intangible Assets [Member]    
Intangible Assets Net Excluding Goodwill [Line Items]    
Weighted Average Remaining Useful Life (in years) 1 year 4 months 24 days  
Amortized intangible assets, Gross Carrying Amount $ 1,500 1,500
Amortized intangible assets, Accumulated Amortization (1,200) (1,103)
Amortized intangible assets, Net Carrying Amount 300 397
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)