XML 12 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Cover page.    
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Entity File Number 1-12672  
Entity Registrant Name AVALONBAY COMMUNITIES, INC.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 77-0404318  
Entity Address, Address Line One Ballston Tower  
Entity Address, Address Line Two 671 N. Glebe Rd, Suite 800  
Entity Address, Address City or Town Arlington  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol AVB  
Security Exchange Name NYSE  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   139,656,943
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22203  
City Area Code 703  
Local Phone Number 329-6300  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Entity Central Index Key 0000915912  
Document Quarterly Report true  
Document Transition Report false