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Notes Payable and Unsecured Credit Facilities Narrative (Details) |  |  | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2017 USD ($) tranche | Feb. 16, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jan. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | $ 150,617,000 | $ 150,617,000 |  |
2017 |  |  | 5,372,000 | 5,372,000 |  |
Senior Notes [Member] | Total notes issued in January [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 650,000,000.0
Senior Notes [Member] | Notes Due February 1, 2047 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | 300,000,000
Senior Notes [Member] | Total notes issued in June [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 300,000,000.0 | $ 300,000,000.0 |  |
Senior Notes [Member] | Notes Maturing 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage of debt instrument holders giving consent |  |  | 96.00% | 96.00% |  |
Face amount |  |  | $ 300,000,000.0 | $ 300,000,000.0 |  |
Stated rate |  |  | 3.75% | 3.75% |  |
Consent fee per $1000 in principal |  |  | $ 1.50 | $ 1.50 |  |
Term Loans [Member] | Notes Due December 2, 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount | $ 300,000,000 |  |  |  |  |
Interest rate floor | 1.824% |  |  |  |  |
Series 6 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Preferred Stock, Redemption Value |  | $ 250,000,000 |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 6.625% |  |  |  |
Equity One Inc. [Member] | Senior Notes [Member] | Notes Maturing 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 3.75% |  |  |  |  |
Debt assumed in acquisition | $ 300,000,000 |  |  |  |  |
Equity One Inc. [Member] | Senior Notes [Member] | Private Placement Notes Maturing 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt assumed in acquisition | $ 200,000,000 |  |  |  |  |
Number of tranches | tranche | 2 |  |  |  |  |
Tranche value | $ 100,000,000 |  |  |  |  |
Equity One Inc. [Member] | Term Loans [Member] | Equity One Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt repaid |  |  | 250,000,000 |  |  |
Equity One Inc. [Member] | Term Loans [Member] | Equity One Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt repaid |  |  | 300,000,000 |  |  |
Equity One Inc. [Member] | Mortgages [Member] | Fixed Rate Mortgage Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt assumed in acquisition | 226,300,000 |  |  |  |  |
Equity One Inc. [Member] | Mortgages [Member] | Variable Rate Mortgage Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt assumed in acquisition | $ 27,800,000 |  |  |  |  |
Accordion Feature [Member] | Equity One Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Increase in borrowing capacity |  |  | 1,000,000,000 |  |  |
Maximum borrowing capacity |  |  | 500,000,000 | 500,000,000 |  |
Tranche One [Member] | Senior Notes [Member] | Notes Due February 1, 2047 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 300,000,000.0
Stated rate |  |  |  |  |  | 4.40%
Discount percent |  |  |  |  |  | 0.9911
Tranche One [Member] | Senior Notes [Member] | Notes Due 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 350,000,000
Stated rate |  |  |  |  |  | 3.60%
Discount percent |  |  |  |  |  | 0.99741
Tranche One [Member] | Equity One Inc. [Member] | Senior Notes [Member] | Private Placement Notes Maturing 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 3.81% |  |  |  |  |
Tranche Two [Member] | Senior Notes [Member] | Notes Due February 1, 2047 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 125,000,000.0 | $ 125,000,000.0 |  |
Stated rate |  |  | 4.40% | 4.40% |  |
Discount percent |  |  | 1.00784 | 1.00784 |  |
Tranche Two [Member] | Senior Notes [Member] | Notes Due 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 175,000,000 | $ 175,000,000 |  |
Stated rate |  |  | 3.60% | 3.60% |  |
Discount percent |  |  | 1.00379 | 1.00379 |  |
Tranche Two [Member] | Equity One Inc. [Member] | Senior Notes [Member] | Private Placement Notes Maturing 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 3.91% |  |  |  |  |
Mortgage Loan Maturities [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  | $ 139,976,000 | $ 139,976,000 |  |
2017 |  |  | 0 | 0 |  |
Minimum [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  | $ 112,000,000 | $ 112,000,000 |  |
Stated rate |  |  | 7.00% | 7.00% |  |
Minimum [Member] | Equity One Inc. [Member] | Mortgages [Member] | Fixed Rate Mortgage Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 3.76% |  |  |  |  |
Maximum [Member] | Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate |  |  | 7.80% | 7.80% |  |
Maximum [Member] | Equity One Inc. [Member] | Mortgages [Member] | Fixed Rate Mortgage Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 7.94% |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt assumed in acquisition |  |  |  | $ 757,399,000 | $ 0 |
Parent Company [Member] | Series 6 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | $ 250,000,000 | 250,000,000 |  |
Preferred Stock, Redemption Value |  |  | 252,000,000 | $ 252,000,000 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.625% |  |
Parent Company [Member] | Series 7 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value |  |  | 75,000,000 | $ 75,000,000 |  |
Preferred Stock, Redemption Value |  |  | $ 75,700,000.0 | $ 75,700,000.0 |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 6.00% |  |

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