Revenue - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($) Segment
Revenue From Contract With Customer [Line Items]
Number of operating segments \| Segment	4
Remaining performance obligations \| $	$ 2.1
Revenue, practical expedient, unsatisfied performance obligations non disclosure	true
Revenue, practical expedient, time value of money for contracts consideration	false
Minimum
Revenue From Contract With Customer [Line Items]
Payment period from contract inception	30 days
Maximum
Revenue From Contract With Customer [Line Items]
Payment period from contract inception	90 days
Hardware Products \| Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Hardware Products \| Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Software Licenses \| Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Software Licenses \| Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	3 years
Software Maintenance and Support Services \| Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Software Maintenance and Support Services \| Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	3 years
Extended Hardware Warranties \| Minimum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	30 days
Contract period	1 year
Extended Hardware Warranties \| Maximum
Revenue From Contract With Customer [Line Items]
Payment period, after shipment	60 days
Contract period	2 years

Revenue from contract with customer.

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Revenue from contract with customer, period.

+ References

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- Definition

Revenue, performance obligation, payment period.

+ References

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Revenue, performance obligation, payment period from inception.

+ References

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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- Definition

Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130569-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL51790836-203054

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Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130558-203045

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

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