Satellite Network and Other Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 12,223	$ 11,022
Amortization of internal-use software	936	1,351
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	3,807	3,097
Fixed Assets [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 8,942	$ 8,330
Depreciation and amortization expense percentage related to cost of services	48.00%	65.00%
Depreciation and amortization expense percentage related to cost of product sales	12.00%	8.00%

Amortization of internal use software.

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- Definition

Capitalized internal costs.

+ References

No definition available.

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- Definition

Depreciation and amortization expense percentage related to cost of product sales.

+ References

No definition available.

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- Definition

Depreciation and amortization expense percentage related To cost of services.

+ References

No definition available.

+ Details

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- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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