Noncontrolling Interests on the Operating Partnership’s Consolidated Financial Statements (Details) - Consolidated property partnerships - Norges Bank Real Estate Management (NBREM)	Aug. 30, 2016 rEITSubsidiary company
Noncontrolling Interest [Line Items]
Contributions, number of REIT subsidiaries \| rEITSubsidiary	2
Ownership interest of limited partnership interests	44.00%
Ownership interest, number of existing companies \| company	2

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

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