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Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (Details) (USD $) | 9 Months Ended
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Sep. 30, 2014 property
Loss Contingencies [Line Items] |
Number of communities owned (in communities) | 141
Cost Incurred to Date | $ 605,034,000
United Dominion Reality L.P. [Member] |
Loss Contingencies [Line Items] |
Number of communities owned (in communities) | 67
Wholly owned — redevelopment [Member] |
Loss Contingencies [Line Items] |
Capital Expenditures Incurred but Not yet Paid | 2,100,000
Number of communities owned (in communities) | 1
Cost Incurred to Date | 80,619,000
Wholly owned — under development [Member] |
Loss Contingencies [Line Items] |
Capital Expenditures Incurred but Not yet Paid | 26,800,000
Number of communities owned (in communities) | 3
Cost Incurred to Date | 321,607,000
Wholly owned — under development [Member] | United Dominion Reality L.P. [Member] |
Loss Contingencies [Line Items] |
Capital Expenditures Incurred but Not yet Paid | 7,000,000
Number of communities owned (in communities) | 1
Cost Incurred to Date | 119,828,000
Expected Costs to Complete | $ 12,172,000

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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