Satellite Network and Other Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 12,409	$ 12,526	$ 25,773	$ 25,204
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	4,371	3,808	7,857	7,293
Fixed Assets [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	9,225	9,276	19,405	18,719
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	4,188	4,249	8,467	8,499
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	521	705	1,030	1,398
Internal-use Software [Member]
Property Plant And Equipment [Line Items]
Amortization of internal-use software	$ 726	$ 742	$ 1,465	$ 1,605