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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
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