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Acquisitions, Dispositions and Other Significant Transactions - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2019
USD ($)
unit
community
Mar. 31, 2018
USD ($)
community
Dec. 31, 2018
USD ($)
community
Mar. 31, 2019
USD ($)
community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of unconsolidated joint ventures, interest sold       6
Number of communities, acquired, previously leased or managed       6
Operating and financing leases, number of communities 342     342
Gain (loss) on sale of assets, net | $ $ (702) $ 43,431    
Gain on facility lease termination | $ (209) $ 0    
Assets held for sale | $ $ 58,323   $ 93,117 $ 58,323
Communities Disposed Of Through Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of       28
Disposal group, number of communities pending to be disposed of 7     7
Communities Disposed Of Through Lease Terminations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of       90
118 Communities Disposed Of By Sales And Lease Terminations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of       118
Sale of 3 communities        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of   3    
Net cash proceeds | $   $ 12,800    
Mortgage notes payable        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Payment for debt extinguishment or debt prepayment cost | $     $ 174,000  
Current Property Ownership Status        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities owned 338      
Operating and financing leases, number of communities 342     342
Number of communities managed 18      
Number of communities managed by third party 146     146
HCP, Inc. | Master Lease Transactions | 33 Communities Disposed Of Through Lease Terminations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of     33  
Assets under leases | $     $ 332,800  
Capital lease obligations | $     $ 378,300  
Number of communities previously subject to sale leaseback transactions     20  
Gain on facility lease termination | $     $ 1,500  
HCP, Inc. | Master Lease Transactions | 20 Of The 33 Communities Disposed Of Through Lease Terminations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of     20  
Gain (loss) on sale of assets, net | $     $ 44,200  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Sale Of 22 Communities        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of     22  
Gain (loss) on sale of assets, net | $   $ 1,900 $ 188,600  
Net cash proceeds | $     $ 380,700  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Six Communities        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities disposed of 6      
Net cash proceeds | $ $ 29,500      
Disposal group, number of units disposed of | unit 485      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | 7 Communities Held For Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of communities classified as held for sale 7      
Assets held for sale | $ $ 58,300     $ 58,300
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Mortgage notes payable | 7 Communities Held For Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Mortgage debt | $ $ 23,400     $ 23,400