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ACQUISITION AND DISPOSITION OF PROPERTIES, DISCONTINUED OPERATIONS AND PROPERTIES HELD FOR SALE - Acquisitions (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) ft² residential_unit | Nov. 30, 2015 USD ($) ft² | Oct. 31, 2015 USD ($) ft² | Sep. 30, 2015 USD ($) ft² | May. 31, 2015 USD ($) ft² | Apr. 30, 2015 USD ($) ft² | Mar. 31, 2015 USD ($) ft² | Jan. 31, 2015 USD ($) ft² | Dec. 31, 2015 USD ($) ft² residential_unit | May. 01, 2015 | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  | 695,168 |  |  |  |  |  |  |  |  | 695,168 |  |
Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  | 305,800 |  |  |  |  |  |  |  |  | 305,800 |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  | $ 204,200 |  |
Debt Assumption |  |  |  |  |  |  |  |  |  |  | 9,800 |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |
Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  | 312,589 |  |  |  |  |  |  |  |  | 312,589 |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  | $ 146,100 |  |
Debt Assumption |  |  |  |  |  |  |  |  |  |  | 1,100 |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  | $ 3,500 |  |
Fund II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  | 0 |  |  |  |  |  |  |  |  | 0 |  |
Purchase Price |  |  |  |  |  |  |  |  |  |  | $ 100,800 |  |
Debt Assumption |  |  |  |  |  |  |  |  |  |  | $ 81,000 |  |
City Center [Member] | San Francisco, California [Member] | Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  |  |  |  |  |  | 205,000 |  |  |  |
Percent Owned |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 155,000 |  |  |  |
Debt Assumption |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
163 Highland Avenue [Member] | Needham, MA [Member] | Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  |  |  |  |  |  | 40,500 |  |  |  |
Percent Owned |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Purchase Price |  |  |  |  |  |  |  |  | $ 24,000 |  |  |  |
Debt Assumption |  |  |  |  |  |  |  |  | $ 9,800 |  |  |  |
Route 202 Shopping Center [Member] | Wilmington, DE [Member] | Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² | [1] |  |  |  |  |  |  | 20,000 |  |  |  |  |
Percent Owned | [1] |  |  |  |  |  |  | 100.00% |  |  |  |  |
Purchase Price | [1] |  |  |  |  |  |  | $ 5,600 |  |  |  |  |
Debt Assumption | [1] |  |  |  |  |  |  | $ 0 |  |  |  |  |
Roosevelt Galleria [Member] | Chicago, Illinois [Member] | Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  |  | 40,300 |  |  |  |  |  |  |  |
Percent Owned |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  | $ 19,600 |  |  |  |  |  |  |  |
Debt Assumption |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
City Point Tower I [Member] | Fund II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Owned |  | 43.00% |  |  |  |  |  |  |  |  | 43.00% |  |
City Point Tower I [Member] | Brooklyn, New York [Member] | Fund II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² | [2] |  |  |  |  | 0 |  |  |  |  |  |  |
Percent Owned |  |  |  |  |  | 95.00% | [2] |  |  |  |  | 43.00% |
Purchase Price | [2] |  |  |  |  | $ 100,800 |  |  |  |  |  |  |
Debt Assumption | [2] |  |  |  |  | $ 81,000 |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  | 52.00% |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  |  |  |  | 95.00% |  |  |  |  |  |  |
Number of Units in Real Estate Property | residential_unit |  | 250 |  |  |  |  |  |  |  |  | 250 |  |
1035 Third Avenue [Member] | New York, New York [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² | [3] |  |  |  |  |  |  |  |  | 53,294 |  |  |
Percent Owned | [3] |  |  |  |  |  |  |  |  | 100.00% |  |  |
Purchase Price | [3] |  |  |  |  |  |  |  |  | $ 51,000 |  |  |
Debt Assumption | [3] |  |  |  |  |  |  |  |  | $ 0 |  |  |
801 Madison Avenue [Member] | New York, New York [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  |  |  |  |  | 6,375 |  |  |  |  |
Percent Owned |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | $ 33,000 |  |  |  |  |
Debt Assumption |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
650 Bald Hill Road [Member] | Warwick, Rhode Island [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  | 225,000 |  |  |  |  |  |  |  |  |
Percent Owned |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  | $ 9,200 |  |  |  |  |  |  |  |  |
Debt Assumption |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
2208-2216 Filmore Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  |  | 7,375 |  |  |  |  |  |  |  |  |
Percent Owned |  |  |  | 90.00% |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  | $ 8,600 |  |  |  |  |  |  |  |  |
Debt Assumption |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
146 Geary Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  | 12,400 |  |  |  |  |  |  |  |  |  |
Percent Owned |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 38,000 |  |  |  |  |  |  |  |  |  |
Debt Assumption |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
2207 Fillmore Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  |  | 3,870 |  |  |  |  |  |  |  |  |  |
Percent Owned |  |  | 90.00% |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  | $ 2,800 |  |  |  |  |  |  |  |  |  |
Debt Assumption |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |
1861 Union Street [Member] | San Francisco, California [Member] | Fund IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
GLA (in square feet) | ft² |  | 4,275 |  |  |  |  |  |  |  |  | 4,275 |  |
Percent Owned |  | 90.00% |  |  |  |  |  |  |  |  | 90.00% |  |
Purchase Price |  | $ 3,500 |  |  |  |  |  |  |  |  |  |  |
Debt Assumption |  | 0 |  |  |  |  |  |  |  |  |  |  |
Acquisitions In 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Allocation |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | 137,120 |  |  |  |  |  |  |  |  | $ 137,120 |  | $ 149,609
Buildings and improvements |  | 413,015 |  |  |  |  |  |  |  |  | 413,015 |  | 418,720
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  | (29,064) |  |  |  |  |  |  |  |  | (29,064) |  | (6,434)
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  | 41,812 |  |  |  |  |  |  |  |  | 41,812 |  | 0
Above and below market debt assumed (included in Mortgages and other notes payable, net) |  | (3,088) |  |  |  |  |  |  |  |  | (3,088) |  | (2,100)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  |  |  |  |  |  |  |  |  |  | (988) |  |
Total Consideration |  | 559,795 |  |  |  |  |  |  |  |  | 559,795 |  | $ 559,795
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  | (12,489) |  |
Buildings and improvements |  |  |  |  |  |  |  |  |  |  | (5,705) |  |
Acquisition-related intangible assets (in Acquired lease intangibles, net) |  |  |  |  |  |  |  |  |  |  | 41,812 |  |
Acquisition-related intangible liabilities (in Acquired lease intangibles, net) |  |  |  |  |  |  |  |  |  |  | (22,630) |  |
Above and below market debt assumed (included in Mortgages and other notes payable) |  |  |  |  |  |  |  |  |  |  | 0 |  |
Acquisitions In 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Allocation |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | 83,890 |  |  |  |  |  |  |  |  | 83,890 |  |
Buildings and improvements |  | 258,926 |  |  |  |  |  |  |  |  | 258,926 |  |
Above and below market debt assumed (included in Mortgages and other notes payable, net) |  | (10,885) |  |  |  |  |  |  |  |  | (10,885) |  |
Total Consideration |  | $ 331,931 |  |  |  |  |  |  |  |  | $ 331,931 |  |
Route 202 Shopping Center [Member] | Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Owned |  | 77.78% |  |  |  |  |  | 77.78% |  |  | 77.78% |  |
[1] | Purchase price represents the 77.78% interest acquired from an unaffiliated third party.
[2] | Fund II previously held a 52% interest in this unconsolidated affiliate. In connection with the disposition of Phase III of this project discussed below, Fund II acquired an additional 43% interest in Tower I of this development project, which is accounted for as an asset acquisition. In total, Fund II now owns 95% of this investment, which is a residential project anticipated to include 250 residential units.
[3] | GLA includes a portion of office space and a below-grade operator controlled parking garage.

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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 Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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