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v3.20.1

Related party transactions - Disclosure of detailed information about reduction of general and administrative expenses and business development expenses (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Amounts invoiced to associates as a reduction of: |  |
General and administrative expenses | $ 23,682 | $ 18,156
Business development expenses | 6,122 | 4,525
Associates [Member] |  |
Amounts invoiced to associates as a reduction of: |  |
General and administrative expenses | 973 | 1,409
Business development expenses | 2,371 | 3,749
Total amounts invoiced to associates | $ 3,344 | $ 5,158

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- Definition The amount of expense relating to selling, general and administrative activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition It represents information about Amounts invoiced to associates as related party + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Business development + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |