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Joint Ventures (Details Textual) - Debt Instrument, Name [Domain] $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Communities | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Communities | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | $ 109,900 |  |
Number of Real Estate Properties | Communities | 136 |  | 136 |  |
Community Threshold, Period Above Occupancy Threshold |  |  | 3 months |  |
Secured Debt | $ 1,350,439 |  | $ 1,350,439 |  | $ 1,361,529
Joint Ventures |  |  |  |  |
Real Estate Owned Gross | 8,425,279 |  | 8,425,279 |  | 8,383,259
Unamortized discount | 5,700 |  | 5,700 |  | 6,700
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture | 191,442 |  | 191,442 |  |
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture | 242,692 |  | 242,692 |  |
Interest expense | (29,673) | $ (31,691) | (58,473) | $ (64,575) |
Company's equity investment in joint venture | 914,815 |  | 914,815 |  | 718,226
Deferred profit from the sale of properties | 6,800 |  | 6,800 |  | $ 28,500
Management fees for our involvement in the joint ventures | 2,600 | 2,300 | 5,200 | 5,600 |
Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  |  | 43,500 |  |
Joint Ventures |  |  |  |  |
Deferred profit from the sale of properties | 24,200 |  | 24,200 |  |
Fee Income from the Sale of Real Estate |  |  | 9,600 |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | 59,100 |  |
Unconsolidated Joint Venture 399 Fremont [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of apartments of development community |  |  |  |  | 0
Unconsolidated Joint Venture Wolff [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment Cost of Ownership Interest, Funded | 129,600 |  | 129,600 |  |
Equity Method Investment Cost of Ownership Interest, Remaining Commitment | $ 6,700 |  | 6,700 |  |
Total Fixed Price Option Sales Price |  |  | $ 597,000 |  |
Number of Markets Operating Within | 3 |  | 3 |  |
Preferred Return Interest Rate |  |  | 650.00% |  |
Community Threshold, Percent Occupancy Threshold |  |  | 8000.00% |  |
Community Threshold, Period Above Occupancy Threshold |  |  | 90 days |  |
Fixed Price Option Period |  |  | 1 year |  |
Joint Ventures |  |  |  |  |
Equity Method Investment Cost of Ownership Interest | $ 136,000 |  | $ 136,000 |  |
Equity Method Investment, Ownership Percentage | 4800.00% |  | 4800.00% |  |
Land [Member] |  |  |  |  |
Joint Ventures |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 1,100 |
Land [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 1 |  | 1 |  |
Operating Community [Member] |  |  |  |  |
Joint Ventures |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 26,700 |  | $ 49,900 |
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 3 |  | 3 |  |
Number of apartment homes | 1,130 |  | 1,130 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 75,531 |  | $ 75,531 |  | $ 80,302
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  | 50.00%
Operating Community [Member] | Unconsolidated Joint Venture UDR Met Life I Partnership [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 4 |  | 4 |  |
Number of apartment homes | 0 |  | 0 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 14,181 |  | $ 14,181 |  | $ 13,306
Equity Method Investment, Ownership Percentage | 16.10% |  | 16.10% |  | 15.70%
Operating Community [Member] | Unconsolidated Joint Venture UDR MetLife II Partnership [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 21 |  | 21 |  |
Number of apartment homes | 4,642 |  | 4,642 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 428,321 |  | $ 428,321 |  | $ 431,277
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  | 50.00%
Operating Community [Member] | Unconsolidated Joint Venture Three Washington DC [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 3 |  | 3 |  |
Number of apartment homes | 660 |  | 660 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 19,775 |  | $ 19,775 |  | $ 21,596
Equity Method Investment, Ownership Percentage | 30.00% |  | 30.00% |  | 30.00%
Operating Community [Member] | Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | Communities | 8 |  | 8 |  |
Joint Ventures |  |  |  |  |
Equity Method Investment, Ownership Percentage | 0.00% |  | 0.00% |  | 20.00%
Operating Community [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 1 |  | 1 |  |
Number of apartment homes | 1,437 |  | 1,437 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 158,172 |  | $ 158,172 |  | $ 134,939
Equity Method Investment, Ownership Percentage | 50.60% |  | 50.60% |  | 50.60%
Operating Community [Member] | Unconsolidated Joint Venture Wolff [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 2 |  | 2 |  |
Number of apartment homes | 1,533 |  | 1,533 |  |
Development Community [Member] | Unconsolidated Joint Venture Four Texas [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 0 |  | 0 |  |
Number of apartment homes | 0 |  | 0 |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 0 |  | $ 0 |  | $ (25,901)
Development Community [Member] | Unconsolidated Joint Venture Other MetLife [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 4 |  | 4 |  |
Development Community [Member] | Unconsolidated Joint Venture Wolff [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of Real Estate Properties | 5 |  | 5 |  |
Development Community [Member] | Preferred Equity Investment West Coast Development JV [Member] |  |  |  |  |
Joint Ventures |  |  |  |  |
Company's equity investment in joint venture | $ 133,627 |  | $ 133,627 |  | $ 0
Equity Method Investment, Preferred Return |  |  | 1,000 |  |
Equity Method Investment, Transaction Expenses |  |  | $ 1,500 |  |

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