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Subsequent Events (Details) (USD $)
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6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 21 Months Ended | 1 Months Ended | ||
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Jun. 30, 2012
home
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Jun. 30, 2011
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Jun. 30, 2012
CEP II
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Jun. 30, 2012
CEP II
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Jul. 31, 2012
Subsequent Events
CEP II
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Jul. 31, 2012
Subsequent Events
CEP II
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Jul. 31, 2012
Subsequent Events
Avalon Del Rey Apartments
home
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Jul. 31, 2012
Subsequent Events
Avalon Del Rey Apartments
Secured notes
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| Subsequent Events | ||||||||
| Number of apartment homes included in joint venture apartment communities owned | 53,144 | 309 | ||||||
| Ownership interest acquired (as a percent) | 30.00% | |||||||
| Repayment of secured debt | $ 43,606,000 | |||||||
| Acquisition of joint venture partner additional equity interest | 3,350,000 | 6,570,000 | 67,200,000 | |||||
| Ownership additional interest acquired (as a percent) | 70.00% | |||||||
| Common stock shares issued | 1,119,892 | 1,119,892 | 315,323 | 3,925,980 | ||||
| Shares sold, average sales price (in dollars per share) | $ 140.14 | $ 140.14 | $ 141.35 | $ 127.36 | ||||
| Net proceeds from sales of shares (in dollars) | $ 175,682,000 | $ 264,134,000 | $ 154,588,000 | $ 154,588,000 | $ 43,901,000 | $ 492,490,000 | ||