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v3.20.2

Acquisitions (Narrative) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) entity | Sep. 30, 2019 USD ($) entity | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) entity
Acquisitions [Abstract] |  |  |  |
Number of immaterial businesses acquired in period | entity | 11 | 13 |  |
Acquisition-related costs | $ 4,497,000 | $ 8,057,000 |  |
Goodwill expected to be deductible for tax purposes | $ 48,926,000 | $ 81,903,000 | $ 48,926,000 | $ 48,926,000
Fair value of acquired working capital is provisional |  |  | 6 | 6

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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- Definition This element represents the number of acquisitions for which the initial accounting is incomplete. + References No definition available. + Details
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Namespace Prefix: | wcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration