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Composition of Certain Balance Sheet Accounts - Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,036,034 $ 1,067,638
Accumulated depreciation (530,450) (507,320)
Total property and equipment, net 505,584 560,318
Office Equipment, Furniture, Fixtures and Other [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 56,482 56,205
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 44,403 44,389
Airborne Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 709,980 737,593
Network Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 225,169 $ 229,451