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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details)								6 Months Ended		12 Months Ended
	Jun. 29, 2019 USD ($)	Apr. 30, 2019 USD ($) ft²	Mar. 19, 2019 USD ($) ft²	Aug. 29, 2018 USD ($) property	Jun. 29, 2018 USD ($) property	May 15, 2018 USD ($)	Jan. 18, 2018 USD ($) property	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2014 property JointVenture	Oct. 31, 2018 segment
Schedule of Equity Method Investments [Line Items]
Purchase Price								$ 140,512,000		$ 186,463,000
Number of retail properties | property								180
Proceeds from the disposition of properties, net								$ 12,252,000	$ 25,218,000
Fund V Family Center at Riverdale
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage								90.00%
Tri City Plaza
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage								90.00%
BSP I and BSP II
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage											50.00%
Number of Joint Ventures | JointVenture											2
Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage								50.00%
Number of businesses acquired | property											23
Number of retail properties | property								13
Fund I Vs Broughton Street Portfolio Venture
Schedule of Equity Method Investments [Line Items]
Number of retail properties | property					2						8
Losses on cost method investments					$ 1,000,000.0
Fund I Vs Broughton Street Portfolio Venture | Partnership Interest | Maximum
Schedule of Equity Method Investments [Line Items]
Losses on cost method investments					$ 100,000
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Number of retail properties | property				1			2				2
Proceeds from the disposition of properties, net				$ 2,100,000			$ 8,000,000.0
Gain (loss) on disposal				(300,000)			(400,000)
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Partnership Interest
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal							$ 0
Fund IV | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Partnership Interest | Maximum
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal				$ (100,000)
BSP I
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage												100.00%
BSP I | Consolidated Entity
Schedule of Equity Method Investments [Line Items]
Number of retail properties | segment												11
BSP II | Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Number of retail properties | property								2
Fund III's Storage Post venture
Schedule of Equity Method Investments [Line Items]
Distribution from cost method investment	$ 1,600,000					$ 3,200,000
Cost method investments	0
Fund III's Storage Post venture | Partnership Interest
Schedule of Equity Method Investments [Line Items]
Distribution from cost method investment	$ 400,000					$ 800,000
Riverdale, Utah | Fund V Family Center at Riverdale
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in square feet) | ft²			428,000
Purchase Price			$ 48,500,000
Vernon, Connecticut | Tri City Plaza
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (in square feet) | ft²		300,000
Purchase Price		$ 36,700,000

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