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Subsequent Events - Additional Information (Details) $ in Thousands			9 Months Ended	12 Months Ended
	Oct. 23, 2018 USD ($)	Oct. 11, 2018 property JointVenture	Sep. 30, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Number of retail properties | property			170
Purchase Price			$ 105,916	$ 254,532
Fund IV
Subsequent Event [Line Items]
Purchase Price				44,492
Fund V
Subsequent Event [Line Items]
Purchase Price			$ 104,579	$ 167,240
Subsequent Event | Broughton St. Portfolio Savannah, GA | Fund IV
Subsequent Event [Line Items]
Number of joint ventures | JointVenture		2
Number of properties acquired | property		11
Number of retail properties | property		2
Subsequent Event | Hiram Pavilion | Fund V
Subsequent Event [Line Items]
Purchase Price	$ 44,400

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+ References

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
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- Definition

The number of businesses acquired by the entity during the period.

+ References

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- Definition

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+ References

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- 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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- Details

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