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Commitments and Contingencies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) community property Claim multiplier Lease | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Employment Agreements and Arrangements [Abstract] |  |  |
Proceeds from legal recoveries | $ 946 | $ 6,118 | $ 417
Loss Contingency Class Action Claims Filed, Number of Apartments in Settlement, Number of Lawsuits Remaining | Claim | 1 |  |
Lease Obligations [Abstract] |  |  |
Cost related to operating lease | $ 21,788 | 23,431 | 23,343
Number of office leases | Lease | 14 |  |
Payments to acquire other real estate | $ 338,620 | 462,317 | 393,316
Gain (loss) on other real estate transactions, net | 345 | (10,907) | 10,224
Repayments of long-term capital lease obligations | 1,070 | 18,951 | $ 0
Capital leased assets, gross | $ 19,737 | 19,737 |
Properties on Land Subject to Land Leases |  |  |
Lease Obligations [Abstract] |  |  |
Number of apartment communities | community | 11 |  |
Number of operating apartment communities under construction | community | 1 |  |
Number of commercial properties owned | property | 2 |  |
Number of leased properties with purchase options | property | 5 |  |
Assets Held under Capital Leases |  |  |
Lease Obligations [Abstract] |  |  |
Number of apartment communities | community | 1 |  |
Capital lease obligations | $ 20,243 |  |
Restricted stock and stock options |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Retirement age (in years) | 50 years |  |
Period of the non-compete agreement (in years) | 1 year |  |
Restricted stock and stock options | Minimum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Service period (in years) | 10 years |  |
Employee's age at retirement plus years of employment (in years) | 70 years |  |
Written notice period (in years) | 6 months |  |
Restricted stock and stock options | Maximum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Options exercise period upon termination without cause or retirement (in months) | 12 months |  |
Officer Severance Program | Vice President and Senior Vice President |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 1 |  |
Officer Severance Program | Executive Vice Presidents |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 2 |  |
Officer Severance Program | Chief Executive Officer |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Compensation multiplier | multiplier | 3 |  |
Officer Severance Program | Maximum |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Termination period following a sale event (in years) | 18 months |  |
Archstone Toscano |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Proceeds from legal recoveries | $ 554 |  |
Memorial Heights Villages |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Proceeds from legal recoveries |  | $ 5,438 |
Avalon at Edgewater |  |  |
Employment Agreements and Arrangements [Abstract] |  |  |
Number of new class action claims filed | Claim | 3 |  |
Number of apartments included in settlement | Claim | 66 |  |
Number of apartments in settlement resolved | Claim | 60 |  |
Number of apartments included in settlement submitted | Claim | 45 |  |
Number of apartments included in settlement submitted amount | $ 6,900 |  |
Number of claims evaluated | Claim | 37 |  |
Number of additional claims | Claim | 4 |  |
Avalon Morningside Park |  |  |
Lease Obligations [Abstract] |  |  |
Payments to acquire other real estate | $ 95,000 |  |
Gain (loss) on other real estate transactions, net | 11,153 |  |
Avalon at Assembly Row and AVA Somerville |  |  |
Lease Obligations [Abstract] |  |  |
Repayments of long-term capital lease obligations | $ 17,285 |  |

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