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Brookdale Lease Amendments and Terminations and the Formation of Two RIDEA Joint Ventures (“Brookdale Transaction”) - RIDEA Subsidiaries (Details)
$ in Thousands
 8 Months Ended 12 Months Ended
Aug. 29, 2014
USD ($)
property
Aug. 29, 2014
USD ($)
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Lease Amendments And Terminations And Joint Venture Formations [Line Items]        
Ownership percentage (as a percent) 49.00% 49.00%    
Net Gain Recognized on Lease Terminations        
Net gain on contract termination     $ 1,103 $ 38,001
RIDEA JV        
Net Gain Recognized on Lease Terminations        
Net gain on contract termination   $ 38,000    
Gain based on fair value of net consideration received for lease terminations   108,000    
Charges related to lease termination write-offs   $ 70,000    
Brookdale Senior Living        
Lease Amendments And Terminations And Joint Venture Formations [Line Items]        
Ownership percentage (as a percent) 20.00% 20.00%    
Brookdale Senior Living | RIDEA JV        
Lease Amendments And Terminations And Joint Venture Formations [Line Items]        
Number of facilities for which existing lease agreement is terminated | property 49      
Number of properties with purchase options cancelled on termination | property 19 19    
Lease Terminations Considerations Received Abstract        
Investment in strategic joint venture $ 47,000 $ 47,000    
Consideration received - Short-term receivable 34,000 34,000    
Consideration received - Note receivable 68,000 68,000    
Effective offset for net consideration paid $ 53,000 $ 53,000