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Common Shares (Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended |
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Jan. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | May 11, 2012 | May 10, 2012 | Dec. 31, 2011 | May 31, 2011 2010 and 2011 ATM Programs [Member] | Mar. 31, 2010 2010 and 2011 ATM Programs [Member] | Sep. 30, 2012 2010 and 2011 ATM Programs [Member] | Sep. 30, 2011 2010 and 2011 ATM Programs [Member] | Sep. 30, 2012 2010 and 2011 ATM Programs [Member] | Sep. 30, 2011 2010 and 2011 ATM Programs [Member] | May 31, 2012 2012 ATM Program [Member] | Sep. 30, 2012 2012 ATM Program [Member] | Sep. 30, 2012 2012 ATM Program [Member] | Jan. 31, 2012 January 2012 Public Equity Offering [Member] | Sep. 30, 2012 Line of Credit [Member]
Maximum aggregate offering price of common shares |  |  |  |  |  |  |  | $ 300,000,000 | $ 250,000,000 |  |  |  |  | $ 300,000,000 |  |  |  |
Amount of current borrowing capacity under unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000
Maximum aggregate offering price of remaining common shares available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 123,600,000 | 123,600,000 |  |
Total net consideration |  |  | $ 693,375,000 | $ 69,863,000 |  |  |  |  |  | $ 0 | $ 32,736,800 | $ 128,128,000 | $ 69,862,900 |  | $ 88,915,900 | $ 173,627,600 | $ 391,600,000 |
Common shares sold |  |  |  |  |  |  |  |  |  | 0 | 506,200 | 1,971,400 | 1,127,900 |  | 1,302,500 | 2,607,900 | 6,612,500 |
Average price per common share sold |  |  |  |  |  |  |  |  |  | $ 0 | $ 65.76 | $ 66.01 | $ 63.13 |  | $ 69.34 | $ 67.63 |  |
Percentage of voting interests acquired | 80.00% | 75.00% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated equity method investments acquired | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units in wholly owned property acquired | 4,034 | 253 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common and preferred stock authorized to issue |  |  |  |  | 185,000,000 | 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Common shares, authorized |  | 175,000,000 | 175,000,000 |  | 175,000,000 |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred shares, authorized |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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