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Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 Communities | Dec. 31, 2015 Communities | Dec. 31, 2015 USD ($) Communities | Dec. 31, 2015 Communities Apartment_Homes | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) Communities Apartment_Homes | Dec. 31, 2015 | Dec. 31, 2015 USD ($) | Dec. 31, 2015 Apartment_Homes | Dec. 31, 2015 States
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties | 133 | 133 | 133 | 133 |  |  | 2 |  |  |
Number of States in which Entity Operates |  |  |  |  |  |  | 10 |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Number of apartments owned | Apartment_Homes |  |  |  |  |  |  |  |  | 40,728 |
Number of apartment homes acquired |  | 358 |  |  |  |  |  |  |  |
Development costs excluding direct costs and capitalized interest |  |  | $ 6,300 |  | $ 9,000 | $ 11,100 |  |  |  |
Capitalized Interest Costs, Including Allowance for Funds Used During Construction |  |  | 16,100 |  | 20,200 | 29,400 |  |  |  |
Other Cost and Expense, Operating |  |  | 9,708 |  | 8,271 | $ 7,136 |  |  |  |
Communities Sold | 12 | 9 |  |  |  |  |  |  |  |
Apartment Homes Sold |  | 2,500 |  | 2,735 |  | 914 |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 408,700 |  | 328,400 | $ 81,100 |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | 138,600 |  |  |  |  |  |  |
Payments for (Proceeds from) Investments |  |  | (387,650) |  | (383,886) | (250,043) |  |  |  |
Gain/(loss) on sales of real estate owned |  |  | $ 251,677 |  | 143,572 | 0 |  |  |  |
Deferred Gain on Sale of Property |  |  |  |  | 24,700 |  |  | $ 6,800 |  |
United Dominion Reality L.P. |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Communities Deconsolidated |  | 7 |  |  |  |  |  |  |  |
Number of Real Estate Properties | Communities | 57 | 57 | 57 | 57 |  |  |  |  |  |
Number of States in which Entity Operates | States |  |  |  |  |  |  |  |  |  | 8
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Number of apartments owned | Apartment_Homes |  |  |  |  |  |  |  |  | 16,974 |
Number of communities acquired apartment homes are within | Communities | 1 |  |  |  |  |  |  |  |  |
Number of apartment homes acquired |  | 421 |  |  |  |  |  |  |  |
Property, Plant and Equipment, Additions |  |  | $ 142,000 |  |  |  |  |  |  |
Development costs excluding direct costs and capitalized interest |  |  | 700 |  | 2,000 | 2,500 |  |  |  |
Capitalized Interest Costs, Including Allowance for Funds Used During Construction |  |  | 200 |  | 2,900 | 5,900 |  |  |  |
Other Cost and Expense, Operating |  |  | 5,923 |  | $ 5,172 | $ 5,728 |  |  |  |
Communities Sold |  | 5 |  |  | 1 | 2 |  |  |  |
Apartment Homes Sold | Apartment_Homes |  |  |  | 1,149 |  | 914 |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 250,900 |  | $ 48,700 | $ 81,100 |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  | 24,400 |  |  |  |  |
Payments for (Proceeds from) Investments |  |  | (232,400) |  | (47,900) |  |  |  |  |
Gain/(loss) on sales of real estate owned |  |  | 158,123 |  | 63,635 | $ 0 |  |  |  |
Deferred Gain on Sale of Property |  |  |  |  | $ 24,622 |  |  | 0 |  |
Unconsolidated Joint Venture Four Texas [Member] | United Dominion Reality L.P. |  |  |  |  |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Communities Sold |  |  |  |  | 2 |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  |  | $ 39,200 |  |  |  |  |
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P. |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties |  |  |  |  |  |  | 13 |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred Gain on Sale of Property |  |  |  |  |  |  |  | $ 296,400 |  |
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P. |  |  |  |  |  |  |  |  |  |
Real Estate Owned (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Gain/(loss) on sales of real estate owned |  |  | $ 133,500 |  |  |  |  |  |  |

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