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Satellite Network and Other Equipment - Additional Information (Detail)
$ in Thousands
3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jul. 31, 2017
OG2Satellite
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Property Plant And Equipment [Line Items]          
Depreciation and amortization expense $ 12,081 $ 12,041   $ 36,146 $ 34,463
Amortization of internal-use software 818 1,602   2,590 4,437
Non-cash impairment charge   31,224     31,224
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 3,224 3,232   9,873 9,840
Fixed Assets [Member]          
Property Plant And Equipment [Line Items]          
Depreciation and amortization expense $ 8,764 $ 8,850   $ 26,321 $ 25,891
Depreciation and amortization expense percentage related to cost of services 49.00% 61.00%   49.00% 63.00%
Depreciation and amortization expense percentage related to cost of product sales 8.00% 8.00%   10.00% 8.00%
OG2 Satellite [Member]          
Property Plant And Equipment [Line Items]          
Non-cash impairment charge   $ 31,224      
Number of satellite loss of communication | OG2Satellite     3    
Removal/decrease in satellite network and other equipment, net   39,576      
Accumulated depreciation on equipment   $ (8,352)