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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Communities Apartment_Homes States $ / shares | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Communities Apartment_Homes States $ / shares | Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2014 USD ($)
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Number of communities owned (in communities) | Communities | 136 |  | 136 |  |  |
Number of states operating within (in states) | 10 |  | 10 |  |  |
Number of apartments owned (in apartments homes) | Apartment_Homes | 39,404 |  | 39,404 |  |  |
Number of communities acquired apartment homes are within | Communities | 0 |  |  |  |  |
Development costs excluding direct costs and capitlized interest | $ 1,600 | $ 2,100 | $ 3,800 | $ 5,500 |  |
Interest capitalized during period | 3,800 | 4,900 | 8,600 | 10,200 |  |
Other Cost and Expense, Operating | 1,769 | 2,162 | 3,535 | 4,088 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 109,900 |  |  |
Gains/(loss) on sales of real estate, net of tax | 79,042 | 26,709 | 79,042 | 51,003 |  |
Deferred profit from the sale of properties | 6,800 |  | 6,800 |  |  | $ 28,500
Casualty-related (recoveries)/charges, net | (843) | 0 | (1,839) | (500) |  |
Casualty (Recoveries)/Charges | $ (843) | 0 | (1,839) | (500) |  |
Payments for (Proceeds from) Investments |  |  | 90,543 | 47,922 |  |
Acquisition of real estate |  |  | $ 24,067 | 0 |  |
Communities Sold | Communities |  |  | 3 |  |  |
Apartment Homes Sold | Apartment_Homes |  |  | 812 |  |  |
United Dominion Reality L.P. [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Number of communities owned (in communities) | Communities | 67 |  | 67 |  |  |
Number of states operating within (in states) | States | 9 |  | 9 |  |  |
Number of apartments owned (in apartments homes) | Apartment_Homes | 20,569 |  | 20,569 |  |  |
Development costs excluding direct costs and capitlized interest | $ 195 | 542 | $ 328 | 1,300 |  |
Interest capitalized during period | 0 | 1,000 | 100 | 2,000 |  |
Other Cost and Expense, Operating | 1,496 | 1,451 | 2,986 | 2,887 |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 45,300 |  |  |
Gains/(loss) on sales of real estate, net of tax | 32,375 | 16,285 | 56,998 | 40,687 |  |
Deferred profit from the sale of properties | 0 |  | 0 |  |  | $ 24,622
Casualty-related (recoveries)/charges, net | 280 | 0 | 873 |  | $ 500 |
Casualty (Recoveries)/Charges | (280) | $ 0 | (873) | $ (500) |  |
Payments for (Proceeds from) Investments |  |  | $ 27,700 |  |  |
Communities Sold | Communities |  |  | 1 |  |  |
Apartment Homes Sold | Apartment_Homes |  |  | 240 |  |  |
Home Acquisition [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Fair Value of Assets Acquired | $ 908,000 |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 35 |  | $ 35 |  |  |
Acquisition of real estate | $ 90,000 |  |  |  |  |
Cash Acquired from Acquisition | $ 65,000 |  |  |  |  |
Number of Properties Purchased | 6 |  |  |  |  |
UDR DownREIT Unit [Member] | Home Acquisition [Member] |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions | $ 753,000 |  |  |  |  |

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