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Subsequent Events (Details) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
May 04, 2018 USD ($) community home | Feb. 28, 2018 USD ($) | Mar. 31, 2018 USD ($) community | Dec. 31, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |
Number of Communities Held for Sale | community |  |  | 2 |
Real Estate Investments, Net |  |  | $ 17,884,547 | $ 17,717,557
Avalon Blue Hills and Avalon Canton at Blue Hills [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of Communities Held for Sale | community | 2 |  |  |
Number of Apartment Homes Held for Sale | home | 472 |  |  |
Real Estate Investments, Net | $ 72,081 |  |  |
Secured notes | Notes Payable Maturities 2018 |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repayments of secured mortgages |  | $ 11,038 |  |
Secured notes | Notes Payable Maturities 2018 | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Repayments of secured mortgages | $ 13,380 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.06% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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