Satellite Network and Other Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 12,654	$ 12,794	$ 38,427	$ 37,998
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	3,390	3,435	11,248	10,728
Fixed Assets [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	9,470	9,544	28,875	28,263
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	4,178	4,236	12,645	12,735
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	534	712	1,564	2,110
Internal-use Software [Member]
Property Plant And Equipment [Line Items]
Amortization of internal-use software	$ 823	$ 767	$ 2,288	$ 2,373