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Investments in and Advances to Unconsolidated Affiliates - Fund Investments - Additional Information (Details)							1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Aug. 29, 2018 USD ($) property	Jun. 29, 2018 USD ($) property	May 15, 2018 USD ($)	Jan. 18, 2018 USD ($) property	Jun. 30, 2017 USD ($)	Feb. 15, 2017 USD ($)	Jan. 31, 2017 USD ($)	Sep. 30, 2018 USD ($) property	Dec. 21, 2017 USD ($) property	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) property	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Cost method investments								$ 556,000				$ 556,000		$ 556,000
Equity in earnings (losses) of unconsolidated affiliates								$ 376,000		$ 4,001,000		$ 7,079,000	$ 21,044,000
Number of retail properties | property								170				170
Proceeds from the disposition of properties, net												$ 52,759,000	47,025,000
Proceeds from sale of equity method investments												$ 23,777,000	$ 31,720,000
Disposed of by sale
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal											$ 3,300,000
Partnership Interest | Disposed of by sale
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal											800,000
Mervyns I and Mervyns II
Schedule of Equity Method Investments [Line Items]
Distribution from equity method investment														1,100,000
Equity method investments														0
Albertson's
Schedule of Equity Method Investments [Line Items]
Cost method investment ownership interest								1.05%				1.05%
Distribution from cost method investment														2,400,000
Cost method investments														0
Equity in earnings (losses) of unconsolidated affiliates														2,000,000
Fund III's Storage Post venture
Schedule of Equity Method Investments [Line Items]
Distribution from cost method investment			$ 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			$ 800,000
Fund IV
Schedule of Equity Method Investments [Line Items]
Equity method investments								$ 67,405,000				$ 67,405,000		82,143,000
Fund IV | Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Number of retail properties | property								13				13
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					5
Proceeds from the disposition of properties, net	$ 2,100,000			$ 8,000,000
Gain (loss) on disposal	(300,000)			(400,000)					$ 1,200,000
Proceeds from sale of equity method investments									11,000,000
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal							$ 6,300,000
Consideration received							19,000,000
Proceeds from sale of equity method investments							10,600,000
Fund IV | Disposed of by sale | 2819 Kennedy Boulevard | Mortgages
Schedule of Equity Method Investments [Line Items]
Repayments of debt							8,400,000
Fund IV | Disposed of by sale | 1701 Belmont Avenue
Schedule of Equity Method Investments [Line Items]
Consideration received					$ 5,600,000						$ 5,600,000
Proceeds from sale of equity method investments					2,700,000
Fund IV | Disposed of by sale | 1701 Belmont Avenue | Mortgages
Schedule of Equity Method Investments [Line Items]
Repayments of debt					2,900,000
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal				$ 0					100,000
Fund IV | Partnership Interest | Disposed of by sale | Broughton St. Portfolio Savannah, GA | Maximum
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal	$ (100,000)
Fund IV | Partnership Interest | Disposed of by sale | 2819 Kennedy Boulevard
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal							1,400,000
Fund IV | Affiliated Entity | Disposed of by sale | Broughton St. Portfolio Savannah, GA
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal									$ 600,000
Fund IV | Affiliated Entity | Disposed of by sale | 2819 Kennedy Boulevard
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal							$ 6,200,000
Fund IV | Affiliated Entity | Disposed of by sale | 1701 Belmont Avenue
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal					$ 3,300,000
Fund IV's Broughton Street Portfolio venture
Schedule of Equity Method Investments [Line Items]
Number of retail properties | property		2
Losses on cost method investments		$ 1,000,000
Fund IV's Broughton Street Portfolio venture | Partnership Interest | Maximum
Schedule of Equity Method Investments [Line Items]
Losses on cost method investments		$ 100,000
Fund III
Schedule of Equity Method Investments [Line Items]
Equity method investments								$ 372,000				$ 372,000		$ 373,000
Fund III | Disposed of by sale | Arundel Plaza
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal						$ 8,200,000
Consideration received						28,800,000
Proceeds from sale of equity method investments						18,800,000
Fund III | Disposed of by sale | Arundel Plaza | Mortgages
Schedule of Equity Method Investments [Line Items]
Repayments of debt						10,000,000
Fund III | Partnership Interest | Disposed of by sale | Arundel Plaza
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal						1,300,000
Fund III | Affiliated Entity | Disposed of by sale | Arundel Plaza
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposal						$ 5,300,000

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