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Mortgage Notes Payable, Unsecured Notes and Credit Facility (Details 2) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Feb. 29, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Jan. 31, 2016
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  | 3.35% |  |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt, net |  |  |  |  | $ 0 | $ (18,987,000) | $ 2,461,000 | $ (26,736,000) |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.95% |  |  |  |  |  |  |  |
Repayments of Unsecured Debt |  |  |  |  |  |  | 250,000,000 | $ 0 |  |
Variable rate unsecured credit facility | $ 170,000,000 |  |  |  | 170,000,000 |  | 170,000,000 |  | $ 0 |
Net carrying value of apartment communities and improved land parcels securing debt | 3,482,680,000 |  |  |  | $ 3,482,680,000 |  | $ 3,482,680,000 |  |  |
Unsecured notes |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of Unsecured Debt | $ 250,000,000 |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 5.75% |  |  |  | 5.75% |  | 5.75% |  |  |
Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Mortgage notes payable held by wholly owned subsidiaries guaranteed by the Company | $ 100,000,000 |  |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |
Unsecured Notes 2.95 Percent [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 475,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 471,751,000 |  |  |  |  |  |  |  |
Notes Payable Maturities 2020 [Member] | Avalon Hoboken [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  |  |  |  |  |  | $ 67,904,000
Current interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.18%
Notes Payable Maturities 2016 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  |  |  | 3.32% |  |  |  |  |  |
Repayments of secured mortgages |  |  |  | $ 16,212,000 |  |  |  |  |  |
Notes Payable Maturities 2046 [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
(Gain) loss on extinguishment of debt, net |  |  | $ (2,461,000) |  |  |  |  |  |  |
Notes Payable Maturities 2046 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  | $ 134,500,000 |  |  |  |  |  |  |
Notes Payable Maturities 2019 [Member] | Avalon Columbia Pike [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 70,507,000 |  |  |  | $ 70,507,000 |  | $ 70,507,000 |  |  |
Current interest rate (as a percent) | 3.38% |  |  |  | 3.38% |  | 3.38% |  |  |
Variable rate unsecured credit facility |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Available borrowing capacity | $ 1,500,000,000 |  |  |  | $ 1,500,000,000 |  | $ 1,500,000,000 |  | $ 1,300,000,000 |
Line of credit facility, extension period |  |  |  |  |  |  | 9 months |  |  |
Extension fee |  |  |  |  |  |  | $ 1,500,000 |  |  |
Period of borrowing rate assumed |  |  |  |  |  |  | 1 month |  |  |
Percent of Credit Facility Available to Competitive Bid Option | 65.00% |  |  |  | 65.00% |  | 65.00% |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  |  |  | 0.125% |  | 0.15% |
Annual facility fee |  |  |  |  |  |  | $ 1,875,000 |  |  |
Variable rate unsecured credit facility |  |  |  |  |  |  |  |  | $ 0 |
Outstanding balance of letters of credit | $ 53,137,000 |  |  |  | $ 53,137,000 |  | $ 53,137,000 |  | $ 43,049,000 |
Variable rate unsecured credit facility | LIBOR |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) | 1.36% |  |  |  | 1.36% |  | 1.36% |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.825% |  |  |
Variable rate unsecured credit facility | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.80% |  |  |
Variable rate unsecured credit facility | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 1.55% |  |  |
Secured Mortgage | LIBOR |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  |  | LIBOR |  |  |
Fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) | 4.40% |  |  |  | 4.40% |  | 4.40% |  | 4.60% |
Variable rate mortgage notes payable, unsecured term loan and Credit Facility |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) | 2.30% |  |  |  | 2.30% |  | 2.30% |  | 1.80% |

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