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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 |

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- Definition 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 + Details
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