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Composition of Certain Balance Sheet Accounts - Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accrued Liabilities, Current [Abstract]    
Employee compensation and benefits $ 23,831 $ 21,008
Airborne equipment and installation costs 35,459 22,442
Airborne partner related accrued liabilities 16,226 14,307
Accrued interest 22,694 40,436
Other 50,054 33,862
Total accrued liabilities $ 148,264 $ 132,055