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Composition of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 976,707 $ 816,989
Accumulated depreciation (362,396) (297,179)
Property and equipment, net 614,311 519,810
Office Equipment, Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 45,230 49,529
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 42,413 42,143
Airborne Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 702,414 557,196
Network Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 186,650 $ 168,121