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Lease Arrangements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($)
Lessor Lease Description [Line Items]
Allowance for credit losses for our investment in sales type leases	$ 0
Minimum [Member]
Lessor Lease Description [Line Items]
Lessor sales type lease arrangement terms for network equipments	18 months
Maximum [Member]
Lessor Lease Description [Line Items]
Lessor sales type lease arrangement terms for network equipments	5 years

X

- Definition

Lessor sales type lease arrangement terms for network equipment.

+ References

No definition available.

+ Details

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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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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- Details

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- Details

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