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Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) property | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment property | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting units | segment |  |  |  |  |  |  |  |  | 3 |  |
Rental income |  |  |  |  |  |  |  |  | $ 152,814,000 | $ 158,632,000 | $ 145,103,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 70,011,000 | 60,751,000 | 49,645,000
Interest expense |  |  |  |  |  |  |  |  | 34,645,000 | 37,297,000 | 39,426,000
Equity in earnings and gains of unconsolidated affiliates |  |  |  |  |  |  |  |  | 39,449,000 | 37,330,000 | 111,578,000
Net income | $ 34,236,000 | $ 326,000 | $ 26,155,000 | $ 73,875,000 | $ 7,871,000 | $ 18,104,000 | $ 85,458,000 | $ 38,537,000 | 134,592,000 | 149,970,000 | 152,146,000
Net income for the period January 1 through December 31, 2015 | 14,415,000 | $ (5,786,000) | $ 8,237,000 | $ 44,950,000 | (1,019,000) | $ 4,328,000 | $ 58,963,000 | $ 21,990,000 | 61,816,000 | 84,262,000 | 81,082,000
Noncontrolling interests | 589,548,000 |  |  |  | 420,866,000 |  |  |  | 589,548,000 | 420,866,000 |
Impairment of asset |  |  |  |  |  |  |  |  | 0 | 5,000,000 | 0
Deferred rent receivables, net | 31,700,000 |  |  |  | 31,300,000 |  |  |  | 31,700,000 | 31,300,000 |
Allowance for doubtful accounts receivable | $ 5,700,000 |  |  |  | 7,500,000 |  |  |  | $ 5,700,000 | 7,500,000 |
Required distribution rate to maintain REIT status (in percent) | 90.00% |  |  |  |  |  |  |  | 90.00% |  |
Capitalized internal leasing costs | $ 1,100,000 |  |  |  | 1,400,000 |  |  |  | $ 1,100,000 | 1,400,000 | 900,000
Minimum [Member] | Building [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (In Years) |  |  |  |  |  |  |  |  | 30 years |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (In Years) |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Building [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (In Years) |  |  |  |  |  |  |  |  | 40 years |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (In Years) |  |  |  |  |  |  |  |  | 20 years |  |
Out-of-period Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  |  |  |  | $ (2,100,000) |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,700,000 |  |
Interest expense |  |  |  |  |  |  |  |  | 700,000 |  |
Equity in earnings and gains of unconsolidated affiliates |  |  |  |  |  |  |  |  | 200,000 |  |
Net income | (4,200,000) |  |  |  |  |  |  |  |  |  |
Net income for the period January 1 through December 31, 2015 | (1,600,000) |  |  |  |  |  |  |  |  |  |
Noncontrolling interests | $ (35,700,000) |  |  |  | $ (31,800,000) |  |  |  | $ (35,700,000) | $ (31,800,000) |
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Interest Held By Operating Partnership |  |  |  |  |  |  |  |  | 95.00% | 95.00% |
Remaining funds rate of distribution to operating partnership (in percent) | 20.00% |  |  |  |  |  |  |  | 20.00% |  |
Equity in earnings and gains of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 39,449,000 | $ 37,330,000 | 111,578,000
Institutional Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Remaining funds rate of distribution to all partners (in percent) | 80.00% |  |  |  |  |  |  |  | 80.00% |  |
Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 117 |  |  |  |  |  |  |  | 117 |  |
Properties owned percentage | 100.00% |  |  |  |  |  |  |  | 100.00% |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 54,582,000 | 46,223,000 | 35,875,000
Interest expense |  |  |  |  |  |  |  |  | 27,435,000 | 27,945,000 | 27,024,000
Equity in earnings and gains of unconsolidated affiliates |  |  |  |  |  |  |  |  | 3,774,000 | 1,169,000 | (77,000)
Net income |  |  |  |  |  |  |  |  | 32,370,000 | 34,757,000 | 41,526,000
Net income for the period January 1 through December 31, 2015 |  |  |  |  |  |  |  |  | $ 3,411,000 | 140,000 | 3,222,000
Impairment of asset |  |  |  |  |  |  |  |  |  | 5,000,000 |
Opportunity Funds |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 65 |  |  |  |  |  |  |  | 65 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 15,429,000 | 14,528,000 | 13,770,000
Interest expense |  |  |  |  |  |  |  |  | 7,210,000 | 9,352,000 | 12,402,000
Equity in earnings and gains of unconsolidated affiliates |  |  |  |  |  |  |  |  | 35,675,000 | 36,161,000 | 111,655,000
Net income |  |  |  |  |  |  |  |  | 116,936,000 | 129,169,000 | 123,351,000
Net income for the period January 1 through December 31, 2015 |  |  |  |  |  |  |  |  | $ 58,405,000 | 84,122,000 | $ 77,860,000
Impairment of asset |  |  |  |  |  |  |  |  |  | 0 |
Core Portfolio and Opportunity Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of retail properties | property | 182 |  |  |  |  |  |  |  | 182 |  |
Non-Recourse Mortgage [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowings, amount | $ 26,300,000.0 |  |  |  |  |  |  |  | $ 26,300,000.0 |  |
Brandywine Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of asset |  |  |  |  |  |  |  |  |  | $ 5,000,000 |
Brandywine Portfolio [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of asset |  |  |  |  |  |  |  |  | $ 1,100,000 |  |

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