Satellite Network and Other Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 11,728		$ 12,409	$ 23,960	$ 25,773
Non-cash impairment charge				6,656
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	3,722		4,371	7,142	7,857
Fixed Assets [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	8,673		9,225	17,737	19,405
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	3,895		4,188	8,282	8,467
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	373		521	724	1,030
Internal-use Software [Member]
Property Plant And Equipment [Line Items]
Amortization of internal-use software	$ 913		$ 726	$ 1,867	$ 1,465
Satellite Networks And Other Equipment
Property Plant And Equipment [Line Items]
Non-cash impairment charge		$ 6,656
Net book value		13,187
Accumulated depreciation		$ 6,531