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Fair value of financial instruments - Disclosure of detailed information about fair value of long-term debt (Details) - Level 1 [Member] - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Disclosure of fair value measurement of assets [line items]
Borrowings not measured at fair value	$ 0	$ 293,281
Fair value [Member]
Disclosure of fair value measurement of assets [line items]
Borrowings not measured at fair value	$ 0	$ 303,000

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

Represents amount of borrowings not measured at fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	or_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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X

- Details

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Namespace Prefix:
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Period Type: