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ORGANIZATION, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Business Interruption Insurance Deductible |  |  |  | $ 100,000
Impairment of asset | 8,183,000 |  | 0 | 6,925,000
Provision for Insurance Deductible Attributable to Loss of Rents |  |  | 100,000 |
Insurance proceeds from involuntary conversion of asset | 0 |  | 3,672,000 | 0
Insurance proceeds from involuntary conversion of asset, other |  |  |  | 6,900,000
Gain on involuntary conversion of asset | 0 |  | 2,368,000 | 0
Deferred Rent Receivables, Net | 23,100,000 |  | 23,600,000 |
Allowance for Doubtful Accounts Receivable | 6,000,000 |  | 6,100,000 |
Additional reserves | 0 |  | 405,000 |
Required Distribution Rate to Maintain REIT Status (in percent) | 90.00% |  |  |
Loss of Anchor Tenant [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Additional reserves |  |  | 400,000 |
Flood [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset |  |  |  | 1,400,000
Funiture, Fixtures and Equipment [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum (In Years) | 5 years |  |  |
Minimum [Member] | Building [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum (In Years) | 30 years |  |  |
Maximum [Member] | Building [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum (In Years) | 40 years |  |  |
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Ownership Interest By General Partner or Managing Partner (in percent) | 97.00% |  |  |
Remaining Funds Rate of Distribution to Operating Partnership (in percent) | 20.00% |  |  |
Institutional Investors [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Remaining Funds Rate of Distribution to All Partners (in percent) | 80.00% |  |  |
Fund I and Mervyns I [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Ownership Interest By General Partner or Managing Partner (in percent) | 37.78% | [1] |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital | 22.22% | [1] |  |
General Partners' Contributed Capital | 90,000,000 | [1] |  |
Managing Members' Contributed Capital | 86,600,000 | [1] |  |
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return | 9.00% | [1] |  |
Partners' Capital Account, Distributions | 86,600,000 | [1] |  |
Fund I [Member] | Granville Centre [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset |  |  |  | 6,900,000
Fund I [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Granville Centre [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset |  |  |  | 1,500,000
Fund II and Mervyns II [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Ownership Interest By General Partner or Managing Partner (in percent) | 20.00% | [2] |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital | 20.00% | [2] |  |
General Partners' Contributed Capital | 300,000,000 | [2] |  |
Managing Members' Contributed Capital | 300,000,000 | [2] |  |
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return | 8.00% | [2] |  |
Partners' Capital Account, Distributions | 131,600,000 | [2] |  |
Fund II [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Partners' Capital Account, Distributions | 47,100,000 | [2] |  |
Fund III [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Ownership Interest By General Partner or Managing Partner (in percent) | 19.90% | [3] |  |
General Partners' Committed Capital | 502,500,000 |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital | 19.90% | [3] |  |
General Partners' Contributed Capital | 475,000,000 | [3] |  |
Managing Members' Contributed Capital | 357,500,000 | [3] |  |
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return | 6.00% | [3] |  |
Partners' Capital Account, Distributions | 203,500,000 | [3] |  |
Fund III [Member] | Walnut Hill Plaza [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset | 1,500,000 |  |  |
Fund III [Member] | Sheepshead Bay [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset | 6,700,000 |  |  |
Fund III [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Sheepshead Bay [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset | 1,300,000 |  |  |
Mervyns I and Mervyns II [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Impairment of asset |  |  | 2,000,000 |
Fund IV [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Ownership Interest By General Partner or Managing Partner (in percent) | 23.12% |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital | 23.12% |  |  |
General Partners' Contributed Capital | 540,600,000 |  |  |
Managing Members' Contributed Capital | 95,900,000 |  |  |
Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners, Preferred Return | 6.00% |  |  |
Partners' Capital Account, Distributions | 0 |  |  |
Brandywine Portfolio [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital | 22.22% | [1] |  |
Square Footage of Real Estate Property (in feet) | 1,000,000 |  |  |
Core Portfolio [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Number of Retail Properties | 77 |  |  |
Properties Owned Percentage | 100.00% |  |  |
Gain on involuntary conversion of asset |  |  | 2,368,000 |
Opportunity Funds [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Number of Retail Properties | 28 |  |  |
Gain on involuntary conversion of asset |  |  | $ 0 |
Core Portfolio and Opportunity Funds [Member] |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |
Number of Retail Properties | 105 |  |  |
[1] | Fund I and Mervyns I have returned all capital and preferred return. The Operating Partnership is now entitled to a Promote on all future cash distributions.
[2] | During 2013, a distribution of $47.1 million was made to the Fund II investors, including the Operating Partnership. This amount is subject to recontribution to Fund II until December 2016, if needed to fund the on-going development and construction of existing projects.
[3] | Original committed capital of Fund III was $502.5 million. During 2012, this amount was reduced to $475.0 million.

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