Satellite Network and Other Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 12,794	$ 12,081	$ 37,998	$ 36,146
Products and Services and Internal-use Software [Member]
Property Plant And Equipment [Line Items]
Company capitalized internal costs attributable to design, development and enhancements of Company's products and services and internal-use software	3,435	3,224	10,728	9,873
Fixed Assets [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	9,544	8,764	28,263	26,321
Fixed Assets [Member] | Service [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense related to cost of services and cost of product sales	4,236	4,295	12,735	12,872
Fixed Assets [Member] | Product [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense related to cost of services and cost of product sales	712	735	2,110	2,524
Internal-use Software [Member]
Property Plant And Equipment [Line Items]
Amortization of internal-use software	$ 767	$ 818	$ 2,373	$ 2,590