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Brookdale Lease Amendments and Terminations and the Formation of Two RIDEA Joint Ventures (Details 4) (USD $)
 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Aug. 29, 2014
item
Sep. 30, 2014
Brookdale Senior Living
Sep. 30, 2014
Brookdale Senior Living
RIDEA JV
Sep. 30, 2014
CCRC JV
Aug. 29, 2014
CCRC JV
item
Sep. 30, 2014
CCRC JV
Brookdale Senior Living
Aug. 29, 2014
CCRC JV
Brookdale Senior Living
item
Sep. 30, 2014
CCRC JV
CCRCJV Prop Co [Member]
Brookdale Senior Living
item
Sep. 30, 2014
CCRC JV
CCRCJV Op Co [Member]
Brookdale Senior Living
item
Lease Amendments And Terminations And Joint Venture Formations [Line Items]                      
Investment in strategic joint venture         $ 47,000,000            
Number of retirement communities             14        
Joint Venture Ownership Percentage 49.00%     20.00%       51.00%      
Number of properties to be leased                   8  
Number of properties to be owned directly                     6
Joint Venture Disclosures [Abstract]                      
Number of retirement communities contributed to joint venture             2   8    
Fair value of retirement communities or properties contributed             162,000,000        
Debt related to retirement communities or properties contributed             569,000,000        
Number of properties contributed to joint venture     48                
Carrying value of properties contributed 91,603,000           92,000,000        
Cash paid $ 467,147,000 $ 63,878,000       $ 370,000,000          
Number of properties intended to be acquired in future                 4