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Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Accounting Policies [Line Items] |  |  |
Deferred Finance Costs, Net |  | $ 0 |
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company | 0.1 |  |
Development costs excluding direct costs and capitalized interest | $ 6,300 | 9,000 | $ 11,100
Interest capitalized during period | 16,100 | 20,200 | 29,400
Advertising expense | 6,400 | 6,000 | 5,700
Secured debt, net | $ 1,376,945 | 1,354,321 |
Minimum | Buildings |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 35 years |  |
Minimum | Building improvements |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Minimum | Furniture, fixtures, equipment, and other assets |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Maximum | Buildings |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 55 years |  |
Maximum | Building improvements |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 35 years |  |
Maximum | Furniture, fixtures, equipment, and other assets |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
United Dominion Reality L.P. |  |  |
Accounting Policies [Line Items] |  |  |
Deferred Finance Costs, Net | $ (2,199) | (4,500) |
Cumulative Adjustment to Net Income Attributable to Noncontrolling Interest |  | 3,300 |
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company | 0.10 |  |
Development costs excluding direct costs and capitalized interest | $ 700 | 2,000 | 2,500
Interest capitalized during period | 200 | 2,900 | 5,900
Advertising expense | 2,400 | 2,500 | $ 2,500
Secured debt, net | $ 475,964 | 927,484 |
United Dominion Reality L.P. | Minimum | Buildings |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 35 years |  |
United Dominion Reality L.P. | Minimum | Building improvements |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
United Dominion Reality L.P. | Minimum | Furniture, fixtures, equipment, and other assets |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
United Dominion Reality L.P. | Maximum | Buildings |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 55 years |  |
United Dominion Reality L.P. | Maximum | Building improvements |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 35 years |  |
United Dominion Reality L.P. | Maximum | Furniture, fixtures, equipment, and other assets |  |  |
Accounting Policies [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Scenario, Previously Reported [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Deferred Finance Costs, Net |  | 22,686 |
Secured debt, net |  | 1,361,529 |
Scenario, Previously Reported [Member] | United Dominion Reality L.P. |  |  |
Accounting Policies [Line Items] |  |  |
Secured debt, net |  | $ 931,959 |

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