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Subsequent Events (Details) - USD ($) $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2017 | Jul. 14, 2017 | Jul. 07, 2017 | Jul. 06, 2017 | Jul. 05, 2017 | Jul. 28, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the disposition of properties |  |  |  |  |  |  |  | $ 0 | $ 150,379 |
Purchase Price |  |  |  |  |  |  |  | 79,712 |  | $ 756,842
Cash distribution received |  |  |  |  |  |  |  | 2,851 | $ 2,974 |
Fund II |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | 49,172 |  |
Mortgages | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | 67,300 |  |
Core Portfolio |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | $ 329,707 |  |
Purchase Price |  |  |  |  |  |  |  |  |  | $ 519,592
Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase Price | $ 44,000 |  |  |  |  |  |  |  |  |
Subsequent Event | Albertson |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Cash distribution received |  |  |  |  |  | $ 2,300 |  |  |  |
Subsequent Event | Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative term |  |  | 10 years |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 25,000 |  |  |  |  |  |  |
Subsequent Event | Core Portfolio | Mortgages |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 28,600 |  |  |  |  |
New Hyde Park Shopping Center | Subsequent Event | Fund III | Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the disposition of properties |  |  |  | $ 22,100 |  |  |  |  |  |
City Point Tower I Property | Subsequent Event | Fund II | Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the disposition of properties |  | $ 96,000 |  |  |  |  |  |  |  |
Cost of real estate sales |  |  |  | $ 92,000 |  |  |  |  |  |
Forecast | City Point Tower I Property | Fund II | Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on disposal of properties |  |  |  |  |  |  | $ 4,000 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Reflects for the period the total of the carrying amount of the commercial, industrial and residential land and buildings sold plus certain overhead and other costs incurred to place the real estate in saleable condition, capitalized interest costs in the properties sold, and inventory impairment losses recognized. This element would most likely be used by an entity whose principal activities involve real estate or which has significant real estate operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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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. + Details
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