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Notes Payable, Unsecured Notes and Credit Facility (Details 2) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | May. 31, 2015 USD ($) | Apr. 30, 2015 USD ($) community loan | Sep. 30, 2015 USD ($) community | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) community extension | Sep. 30, 2014 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Number of operating apartment communities | community |  |  |  |  | 255 |  | 255 |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  | $ 18,987,000 | $ 0 | $ 26,736,000 | $ (412,000) |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.45% |  |  |  |  |  |  |
Variable rate unsecured credit facility |  |  |  |  | 0 |  | 0 |  |  | $ 0
Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Mortgage notes payable held by wholly owned subsidiaries guaranteed by the Company |  |  |  |  | 234,500,000 |  | 234,500,000 |  |  |
Unsecured Notes 3.45 Percent [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Principal amount of notes issued |  |  | $ 525,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 520,653,000 |  |  |  |  |  |  |
Variable Rate Unsecured Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Additional amount with option to draw |  |  |  |  |  |  |  |  | $ 50,000,000 |
Principal amount of notes issued |  |  |  |  |  |  |  |  | $ 300,000,000 |
Notes payable maturing in 2015 | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages |  |  |  | $ 481,582,000 |  |  |  |  |  |
Mortgage Loans on Real Estate, Number of Loans | loan |  |  |  | 8 |  |  |  |  |  |
Number of operating apartment communities | community |  |  |  | 8 |  |  |  |  |  |
Current interest rate (as a percent) |  |  |  | 3.12% |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  | $ 8,724,000 |  |  |  |  |  |
Notes Payable Maturities 2041 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  | 7.50% |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | $ (455,000) |  |  |  |  |  |  |  |
Repayments of Debt |  | $ 15,778,000 |  |  |  |  |  |  |  |
Notes Payable Maturities 2027 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  | 7.84% |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | $ (263,000) |  |  |  |  |  |  |  |
Repayments of Debt |  | $ 7,805,000 |  |  |  |  |  |  |  |
Notes payable maturing in 2019 | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  | 5.95% |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | $ (259,000) |  |  |  |  |  |  |  |
Repayments of Debt |  | $ 74,531,000 |  |  |  |  |  |  |  |
Notes Payable Maturities 2053 [Member] | Mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Repayments of secured mortgages | $ 140,346,000 |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) | 5.56% |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | $ 18,987,000 |  |  |  |  |  |  |  |  |
Prepayment Penalty | 11,228,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium, Write-off | $ 30,215,000 |  |  |  |  |  |  |  |  |
Variable rate unsecured credit facility |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  | 1,300,000,000 |  | $ 1,300,000,000 |  |  |
Line of credit facility, extension period |  |  |  |  |  |  | 1 year |  |  |
Number of extension options | extension |  |  |  |  |  |  | 2 |  |  |
Extension period under each option |  |  |  |  |  |  | 6 months |  |  |
Extension fee |  |  |  |  |  |  | $ 1,950,000 |  |  |
Period of borrowing rate assumed |  |  |  |  |  |  | 1 month |  |  |
Annual facility fee |  |  |  |  |  |  | $ 1,950,000 |  |  |
Outstanding balance of letters of credit |  |  |  |  | 43,580,000 |  | 43,580,000 |  |  | 49,407,000
Variable rate unsecured credit facility |  |  |  |  | 0 |  | 0 |  |  | $ 0
Net carrying value of apartment communities and improved land parcels securing debt |  |  |  |  | $ 3,363,527,000 |  | $ 3,363,527,000 |  |  |
Fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Weighted average interest rate, debt (as a percent) |  |  |  |  | 4.70% |  | 4.70% |  |  | 4.50%
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) |  |  |  |  | 1.70% |  | 1.70% |  |  | 1.80%
LIBOR | Variable Rate Unsecured Term Loan [Member] | Unsecured notes |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  |  | LIBOR |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 1.45% |  |  |
LIBOR | Secured Mortgage |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Debt instrument variable rate |  |  |  |  |  |  | LIBOR |  |  |
LIBOR | Variable rate unsecured credit facility |  |  |  |  |  |  |  |  |  |
Notes Payable, Unsecured Notes and Credit Facility |  |  |  |  |  |  |  |  |  |
Current interest rate (as a percent) |  |  |  |  | 1.14% |  | 1.14% |  |  |
Debt instrument, basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.95% |  |  |

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