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Acquisitions of Real Estate Property (Details 7) (Cogdell Acquisition, USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2011
property
management
Dec. 31, 2011
Pending Acquisition    
Ownership interest acquired (as a percent) 100.00% 100.00%
Number of MOBs in which ownership interest acquired 72  
Number of MOBs acquired and managed by property management business 44  
Right to receive cash per share on each outstanding share of common stock outstanding (in dollars per share)   $ 4.25
Right to receive cash per share on each outstanding unit of limited partnership interest outstanding (in dollars per share)   $ 4.25
Consideration per share for each outstanding share of preferred stock (in dollars per share)   $ 25
Minimum
   
Pending Acquisition    
Expected investment including share of debt under a definitive agreement 760.0 $ 760.0
Maximum
   
Pending Acquisition    
Expected investment including share of debt under a definitive agreement 770.0 $ 770.0