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Shareholders' Equity (Summary of Warrant and Deferred Share Unit Activity) (Detail) - Deferred Share Units [Member] | 9 Months Ended
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Sep. 30, 2020 shares
Warrant |
Outstanding at beginning | 18,970
Granted | 2,616
Outstanding at ending | 21,586

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options [Abstract] + References No definition available. + Details
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Namespace Prefix: | wcn_
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Balance Type: | na
Period Type: | duration

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- Definition The number of equity-based instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | wcn_
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Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |