v2.3.0.15
Stockholder's Equity (Details Textuals) (USD $)
1 Months Ended
Feb. 28, 2011
Sep. 30, 2011
Aug. 19, 2011
Jul. 02, 2011
Jun. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Atria Senior Living Acquisition [Member]
May 12, 2011
Atria Senior Living Acquisition [Member]
Sep. 30, 2011
Nationwide Health Properties [Member]
Jul. 12, 2011
Nationwide Health Properties [Member]
Jul. 02, 2011
Nationwide Health Properties [Member]
Business Acquisition [Line Items]           
Shares reserved for issuance in connection with equity awards and other convertible or exchangeable securities        2,253,366  
Common stock share value issued related to acquisition       $ 1,380,000,000  $ 5,400,000,000
Accrued dividend         23,800,000 
Prorated Per Share Dividend Payable $ 0.575$ 0.4486 $ 0.1264      
Common stock shares issued related to acquisition per share       $ 55.33  $ 53.74
Common stock, shares issued       24,958,543  99,849,106
Shares reduced for working capital adjustment with purchase agreement      83,441    
Stockholders' Equity (Textuals) [Abstract]           
Shares of common stock issued and sold in an underwritten public offering5,563,000          
Aggregate proceeds from the sale of common stock in an underwritten public offering pursuant$ 300,000,000          
Capital stock authorized   610,000,000       
Common stock, shares authorized 600,000,000 600,000,000 300,000,000     
Common stock, par value $ 0.25 $ 0.25 $ 0.25     
Preferred stock, shares authorized 10,000,000 10,000,000 10,000,000     
Preferred stock, par value $ 1.00 $ 1.00 $ 1.00