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Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 Communities Apartment_Homes Markets shares | Jun. 30, 2014 | Jun. 30, 2015 Communities Apartment_Homes Markets shares | Jun. 30, 2014 | Dec. 31, 2014 shares
Entity Information [Line Items] |  |  |  |  |
Number of Real Estate Properties | Communities | 136 |  | 136 |  |
Number of apartments owned (in apartments homes) | Apartment_Homes | 39,404 |  | 39,404 |  |
Operating Partnership outstanding units | 183,278,698 |  | 183,278,698 |  |
Percentage of units outstanding in Heritage OP | 4.90% |  | 4.90% |  |
Limited Partners [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Operating Partnership outstanding units | 9,062,689 |  | 9,062,689 |  |
United Dominion Reality L.P. [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Rental revenues percent of General Partner's consolidated rental revenues | 53.00% | 52.00% | 53.00% | 52.40% |
Number of Real Estate Properties | Communities | 67 |  | 67 |  |
Number of markets operating within (in markets) | Markets | 17 |  | 17 |  |
Number of apartments owned (in apartments homes) | Apartment_Homes | 20,569 |  | 20,569 |  |
OP units outstanding related to general partner | 110,883 |  | 110,883 |  | 110,883
OP units outstanding related to limited partner | 183,167,815 |  | 183,167,815 |  | 183,167,815
General Partner [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Operating Partnership outstanding units | 174,216,009 |  | 174,216,009 |  |
Non-affiliated Partners [Member] |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
OP units outstanding related to limited partner | 9,062,689 |  | 9,062,689 |  | 9,165,473
Percentage of units outstanding in Heritage OP | 4.90% |  | 4.90% |  | 5.00%

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