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Composition of Certain Balance Sheet Accounts - Schedule of Other Non-Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other Assets, Noncurrent [Abstract]    
Deferred cost of equipment revenue $ 40,493 $ 14,159
Deposits on satellite and airborne equipment 8,371 10,800
Other 9,644 3,129
Total other non-current assets $ 58,508 $ 28,088