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Organization, Formation and Structure (Details)	Sep. 30, 2016 partnership property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Distribution of REIT taxable income (excluding net capital gains) to its stockholders	90.00%
Number of partnerships | partnership	2
Shopping Centers
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	49
Mixed-Use Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	7
Non-operating Development Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	3

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Minimum Percentage of Taxable Income Distribution to Shareholders

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Number of Partnerships

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Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

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The number of real estate properties owned as of the balance sheet date.

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