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UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Rental income | $ 302,745 | $ 289,008 | $ 278,463 | $ 267,922 | $ 264,732 | $ 263,256 | $ 256,634 | $ 250,483 | $ 1,138,138 | $ 1,035,105 | $ 984,309
Net income/(loss) |  |  |  |  |  |  |  |  | 199,579 | 221,542 | 132,655
Income/(loss) | 105,237 | 29,422 | 38,318 | 26,602 | 89,615 | 20,258 | 22,444 | 89,225 | 199,579 | 221,542 | 132,655
Net income/(loss) attributable to OP unitholders |  |  |  |  |  |  |  |  | 184,965 | 203,106 | 121,558
United Dominion Realty L.P. |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Rental income | 111,389 | 111,700 | 110,350 | 108,334 | 108,523 | 109,539 | 107,266 | 106,592 | 441,773 | 431,920 | 419,377
Income/(loss) | 24,568 | 27,283 | 27,810 | 24,334 | 86,324 | 28,135 | 25,181 | 91,845 | 103,995 | 231,485 | 107,855
Net income/(loss) attributable to OP unitholders | $ 23,988 | $ 26,835 | $ 27,394 | $ 23,946 | $ 85,880 | $ 27,695 | $ 24,761 | $ 91,427 | $ 102,163 | $ 229,763 | $ 106,307
Income/(loss) attributable to OP unitholders per weighted average OP Unit - basic and diluted | $ 0.13 | $ 0.15 | $ 0.15 | $ 0.13 | $ 0.47 | $ 0.15 | $ 0.13 | $ 0.50 | $ 0.56 | $ 1.25 | $ 0.58

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- Definition Amount of income (loss) before gain (loss) on sale of properties of Real Estate Investment Trust (REIT). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77888421&loc=SL77919311-209978 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306 + Details
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