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Real Estate - Schedule of Property Dispositions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale	$ 5,140	$ 48,886	$ 81,965
Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale Price	66,500	281,338
Gain (Loss) on Sale	$ 5,140	$ 48,886	$ 81,965
Fund II
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Apr. 17, 2018
Fund II | Disposal Group, Not Discontinued Operations | Sherman Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Apr. 17, 2018
Sale Price	$ 26,000
Gain (Loss) on Sale	$ 33
Fund II | Disposal Group, Not Discontinued Operations | 216th Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Sep. 11, 2017
Sale Price		$ 30,579
Gain (Loss) on Sale		$ 6,543
Fund II | Disposal Group, Not Discontinued Operations | City Point Condominium Tower I
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Oct. 13, 2017
Sale Price		$ 96,000
Gain (Loss) on Sale		$ (810)
Fund II | Disposal Group, Not Discontinued Operations | 260 E 161th Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Dec. 13, 2017
Sale Price		$ 105,684
Gain (Loss) on Sale		$ 31,537
Fund IV | Disposal Group, Not Discontinued Operations | Lake Montclair
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Aug. 27, 2018
Sale Price	$ 22,450
Gain (Loss) on Sale	$ 2,923
Fund IV | Disposal Group, Not Discontinued Operations | 1861 Union Street
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Aug. 29, 2018
Sale Price	$ 6,000
Gain (Loss) on Sale	$ 2,184
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario One
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Nov. 30, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Two
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 10, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Three
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 17, 2018
Fund IV | Disposal Group, Not Discontinued Operations | Bowery4 Residential Condos New York N Y | Scenario Four
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold	Dec. 21, 2018
Sale Price	$ 12,050
Fund IV | Disposal Group, Not Discontinued Operations | 1151 Third Avenue
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Nov. 16, 2017
Sale Price		$ 27,000
Gain (Loss) on Sale		$ 5,183
Fund III | Disposal Group, Not Discontinued Operations | New Hyde Park Shopping Center
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Date Sold		Jul. 06, 2017
Sale Price		$ 22,075
Gain (Loss) on Sale		$ 6,433

X

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Proceeds from sale of real estate held-for-investment, gross.

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

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