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Satellite Network and Other Equipment, Net - Summary of Satellite Network and Other Equipment, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross $ 327,791 $ 310,594
Less: accumulated depreciation and amortization (195,029) (165,041)
Satellite network and other equipment, net 132,762 145,553
Land [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross 381 381
Satellite Network [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross 200,398 198,746
Capitalized Software [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross 94,994 83,320
Computer Hardware [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross 7,250 6,528
Other [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross 13,098 7,787
Assets under Construction [Member]    
Property Plant And Equipment [Line Items]    
Satellite network and other equipment, gross $ 11,670 $ 13,832