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Composition of Certain Balance Sheet Accounts - Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities, Current [Abstract]    
Employee compensation and benefits $ 25,621 $ 21,008
Airborne equipment and installation costs 44,059 22,442
Airborne partner related accrued liabilities 13,566 14,307
Accrued interest 47,649 40,436
Accrued revenue share 17,339 15,521
Other 53,581 33,862
Total accrued liabilities $ 201,815 $ 147,576