CAPITAL MANAGEMENT - Declaration of Trust (Details)	Dec. 31, 2023
Disclosure of objectives, policies and processes for managing capital [abstract]
Maximum percentage of total indebtedness on Gross Book Value	65.00%
Maximum percentage of proposed investment on Gross Book Value	15.00%

The maximum percentage of proposed investment on Gross Book Value.

No definition available.

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Namespace Prefix:	grpu_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant