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Basis of Presentation (Details)
6 Months Ended
Jun. 30, 2013
property
Jun. 30, 2012
Dec. 31, 2012
Properties:      
Wholly owned properties included in consolidation 221    
Partially owned properties included in consolidation 18    
Total number of joint venture properties 87    
Number of joint venture properties managed by the entity 71    
Number of International joint venture properties 13    
Number of joint venture properties managed by others 16    
Ownership interest:      
Weighted average ownership percentage in the Operating Partnership 85.60% 83.10%  
Ownership percentage in the Operating Partnership 85.60%   85.60%