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Acquisitions of Real Estate Property (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2010
Sunrise Acquisition
property
Dec. 31, 2011
Other Acquisitions
Business acquisition    
Senior housing communities acquired 58  
Purchase price of acquisition of assets $ 186.0  
Assumption of mortgage debt $ 144.0 $ 134.9
Noncontrolling interest percentage acquired, low end of range 15.00%  
Noncontrolling interest percentage acquired, high end of range 25.00%  
Acquired ownership interest in 79 seniors housing communities (as a percent) 100.00%  
Number of seniors housing communities involved with Sunrise 79