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Subsequent Events (Details)			9 Months Ended
	Oct. 23, 2018 USD ($) ft²	Oct. 09, 2018 USD ($) ft²	Sep. 30, 2018 USD ($)	Oct. 05, 2018 USD ($)
Subsequent Event [Line Items]
Payments to acquire new property			$ 372,080,000
Purchase price of assets acquired			$ 220,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Commitment to fund investments				$ 20,000,000.0
Subsequent Event | Ferry Building Property
Subsequent Event [Line Items]
Payments to acquire new property		$ 291,000,000.0
Ownership Interest		55.00%
Subsequent Event | Ferry Building Property, Class A Office
Subsequent Event [Line Items]
Area of real estate property, retail and entertainment space (in square feet) | ft²		192,532
Subsequent Event | Ferry Building Property, Retail
Subsequent Event [Line Items]
Area of real estate property, retail and entertainment space (in square feet) | ft²		75,486
Subsequent Event | 6660 Santa Monica
Subsequent Event [Line Items]
Area of real estate property, retail and entertainment space (in square feet) | ft²	11,200
Purchase price of assets acquired	$ 10,000,000.0

X

- Definition

Agreement To Fund, Financial Investment, Aggregate Amount

+ References

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+ Details

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- Definition

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+ References

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- Definition

Asset Acquisition, Purchase Price

+ References

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+ Details

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X

- Definition

Area of a real estate property.

+ References

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+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=SL6759159-111685

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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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