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Lease Arrangements - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Lessor Lease Description [Line Items] |  |
Allowance for credit losses for our investment in sales type leases | $ 0 | $ 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 |

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- Definition Lessor sales type lease arrangement terms for network equipment. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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

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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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- Details
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- Details
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