v2.4.0.6

Stockholders' Equity (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 26 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Archstone Enterprise LP | Dec. 31, 2012 CEP II and CEP III | Nov. 30, 2010 CEP II | Dec. 31, 2012 CEP II | Dec. 31, 2012 CEP II | Aug. 31, 2012 CEP III | Dec. 31, 2012 CEP III
Equity |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 140,000,000 | 140,000,000 |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  | 16,675,000 | 18,840,206 |  | 1,435,215 | 3,925,980 |  | 729,991
Common stock shares issued in connection with stock options exercised | 407,784 |  |  |  |  |  |  |  |  |
Common stock shares issued through dividend reinvestment plan | 2,331 | 3,343 | 5,687 |  |  |  |  |  |  |
Common stock shares issued in connection with stock grants | 96,592 | 511,817 | 102,984 |  |  |  |  |  |  |
Number of shares of stock grants withheld | 121,351 | 129,762 | 48,882 |  |  |  |  |  |  |
Restricted common stock shares forfeited | 4,027 |  |  |  |  |  |  |  |  |
Common stock shares issued for Employee Stock Purchase Plan | 6,260 |  |  |  |  |  |  |  |  |
Options of common stock granted to employees (in shares) | 115,303 |  |  |  |  |  |  |  |  |
Common stock shares issued, offer price (in dollars per share) |  |  |  | $ 130.00 |  |  |  |  |  |
Net proceeds from common stock shares issued | $ 2,414,775,000 | $ 1,035,302,000 | $ 380,973,000 | $ 2,102,718,000 |  |  |  |  |  |
Maximum value of shares of common stock that can be sold (in dollars) |  |  |  |  |  | 500,000,000 |  |  | 750,000,000 |
Period during which common stock can be sold |  |  |  |  |  | 36 months |  |  | 36 months |
Percentage of compensation received by sales agent |  |  |  |  |  |  |  |  |  | 1.50%
Shares sold, average sales price (in dollars per share) |  |  |  |  |  |  | $ 140.41 | $ 127.36 |  | $ 142.09
Net proceeds from sales of shares (in dollars) | $ 2,430,190,000 | $ 1,049,835,000 | $ 381,365,000 |  |  |  | $ 198,489,000 | $ 492,490,000 |  | $ 102,168,000

X
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