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SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) - Disaggregation (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Disaggregation of revenue        
Rental income $ 243,299 $ 229,400 $ 710,410 $ 677,708
Operating Leases, Income Statement, Lease Revenue, Total $ 263,256 248,264 $ 770,373 734,193
Same store communities | item 38,307   37,673  
Same Store Communities West Region        
Disaggregation of revenue        
Rental income $ 95,447 91,399 $ 277,317 265,595
Operating Leases, Income Statement, Lease Revenue, Total 102,615 98,264 298,456 286,040
Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Rental income 51,291 49,772 152,866 148,916
Operating Leases, Income Statement, Lease Revenue, Total 55,323 53,539 164,811 160,399
Same Store Communities Northeast Region        
Disaggregation of revenue        
Rental income 37,201 36,726 110,541 109,495
Operating Leases, Income Statement, Lease Revenue, Total 38,822 38,162 114,974 113,814
Same Store Communities Southeast Region        
Disaggregation of revenue        
Rental income 27,773 26,221 81,555 77,697
Operating Leases, Income Statement, Lease Revenue, Total 30,984 29,297 91,472 87,103
Same Store Communities Southwest Region        
Disaggregation of revenue        
Rental income 11,647 11,446 29,561 29,126
Operating Leases, Income Statement, Lease Revenue, Total 12,902 12,620 32,696 32,181
Non-Mature communities/Other        
Disaggregation of revenue        
Rental income 19,940 13,836 58,570 46,879
Operating Leases, Income Statement, Lease Revenue, Total 22,610 16,382 67,964 54,656
United Dominion Reality L.P.        
Disaggregation of revenue        
Rental income 101,063 97,014 297,607 287,152
Operating Leases, Income Statement, Lease Revenue, Total $ 109,539 105,253 $ 323,397 311,946
Same store communities | item 16,216   16,216  
United Dominion Reality L.P. | Same Store Communities West Region        
Disaggregation of revenue        
Rental income $ 57,629 54,855 $ 169,638 161,828
Operating Leases, Income Statement, Lease Revenue, Total 62,320 59,383 183,885 175,378
United Dominion Reality L.P. | Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Rental income 14,065 13,615 41,944 41,008
Operating Leases, Income Statement, Lease Revenue, Total 15,085 14,657 45,172 44,203
United Dominion Reality L.P. | Same Store Communities Northeast Region        
Disaggregation of revenue        
Rental income 13,048 13,020 38,774 38,671
Operating Leases, Income Statement, Lease Revenue, Total 13,771 13,746 40,780 40,850
United Dominion Reality L.P. | Same Store Communities Southeast Region        
Disaggregation of revenue        
Rental income 11,834 11,057 34,479 32,893
Operating Leases, Income Statement, Lease Revenue, Total 13,262 12,448 38,881 37,171
United Dominion Reality L.P. | Non-Mature communities/Other        
Disaggregation of revenue        
Rental income 4,487 4,467 12,772 12,752
Operating Leases, Income Statement, Lease Revenue, Total 5,101 5,019 14,679 14,344
Reimbursements Revenue        
Disaggregation of revenue        
Disaggregated income 11,696 10,918 35,004 33,275
Reimbursements Revenue | Same Store Communities West Region        
Disaggregation of revenue        
Disaggregated income 4,415 4,111 12,908 12,295
Reimbursements Revenue | Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Disaggregated income 2,247 2,121 6,850 6,629
Reimbursements Revenue | Same Store Communities Northeast Region        
Disaggregation of revenue        
Disaggregated income 672 691 1,952 2,131
Reimbursements Revenue | Same Store Communities Southeast Region        
Disaggregation of revenue        
Disaggregated income 1,730 1,634 5,124 4,872
Reimbursements Revenue | Same Store Communities Southwest Region        
Disaggregation of revenue        
Disaggregated income 651 624 1,649 1,572
Reimbursements Revenue | Non-Mature communities/Other        
Disaggregation of revenue        
Disaggregated income 1,981 1,737 6,521 5,776
Reimbursements Revenue | United Dominion Reality L.P.        
Disaggregation of revenue        
Disaggregated income 5,251 4,995 15,760 15,154
Reimbursements Revenue | United Dominion Reality L.P. | Same Store Communities West Region        
Disaggregation of revenue        
Disaggregated income 2,940 2,732 8,763 8,248
Reimbursements Revenue | United Dominion Reality L.P. | Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Disaggregated income 580 572 1,869 1,806
Reimbursements Revenue | United Dominion Reality L.P. | Same Store Communities Northeast Region        
Disaggregation of revenue        
Disaggregated income 422 483 1,200 1,451
Reimbursements Revenue | United Dominion Reality L.P. | Same Store Communities Southeast Region        
Disaggregation of revenue        
Disaggregated income 770 728 2,302 2,218
Reimbursements Revenue | United Dominion Reality L.P. | Non-Mature communities/Other        
Disaggregation of revenue        
Disaggregated income 539 480 1,626 1,431
Other Revenue        
Disaggregation of revenue        
Disaggregated income 8,261 7,946 24,959 23,210
Other Revenue | Same Store Communities West Region        
Disaggregation of revenue        
Disaggregated income 2,753 2,754 8,231 8,150
Other Revenue | Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Disaggregated income 1,785 1,646 5,095 4,854
Other Revenue | Same Store Communities Northeast Region        
Disaggregation of revenue        
Disaggregated income 949 745 2,481 2,188
Other Revenue | Same Store Communities Southeast Region        
Disaggregation of revenue        
Disaggregated income 1,481 1,442 4,793 4,534
Other Revenue | Same Store Communities Southwest Region        
Disaggregation of revenue        
Disaggregated income 604 550 1,486 1,483
Other Revenue | Non-Mature communities/Other        
Disaggregation of revenue        
Disaggregated income 689 809 2,873 2,001
Other Revenue | United Dominion Reality L.P.        
Disaggregation of revenue        
Disaggregated income 3,225 3,244 10,030 9,640
Other Revenue | United Dominion Reality L.P. | Same Store Communities West Region        
Disaggregation of revenue        
Disaggregated income 1,751 1,796 5,484 5,302
Other Revenue | United Dominion Reality L.P. | Same Store Communities Mid-Atlantic Region        
Disaggregation of revenue        
Disaggregated income 440 470 1,359 1,389
Other Revenue | United Dominion Reality L.P. | Same Store Communities Northeast Region        
Disaggregation of revenue        
Disaggregated income 301 243 806 728
Other Revenue | United Dominion Reality L.P. | Same Store Communities Southeast Region        
Disaggregation of revenue        
Disaggregated income 658 663 2,100 2,060
Other Revenue | United Dominion Reality L.P. | Non-Mature communities/Other        
Disaggregation of revenue        
Disaggregated income $ 75 $ 72 $ 281 $ 161