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Acquisitions, Dispositions and Other Significant Transactions - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended 21 Months Ended
Sep. 30, 2019
USD ($)
community
Sep. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
community
Sep. 30, 2019
USD ($)
community
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
community
Sep. 30, 2019
USD ($)
community
Sep. 30, 2019
USD ($)
community
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of unconsolidated joint ventures, interest sold               5
Number of communities, acquired, previously leased or managed               6
Operating and financing leases, number of communities 335     335     335 335
Number of communities disposed through sales or termination of lease             77  
Gain (loss) on sale of assets, net | $ $ 579 $ 9,833   $ 2,723 $ 76,586      
Assets held for sale | $ 60,404     $ 60,404   $ 93,117 $ 60,404 $ 60,404
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       30        
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               97
127 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               127
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    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of communities disposed of           22    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Eight Communities                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of communities disposed of       8        
Net cash proceeds | $       $ 44,100        
Gain (loss) on sale of assets, net | $       $ 900        
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Six 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       6        
Assets held for sale | $ 60,400     $ 60,400     60,400 $ 60,400
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]                
Net cash proceeds | $           $ 380,700    
Gain (loss) on sale of assets, net | $     $ 1,900     188,600    
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Mortgage notes payable                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Mortgage debt | $ 30,800     30,800   $ 31,200 30,800 30,800
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Mortgage notes payable | Six Communities Held For Sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Mortgage debt | $ $ 30,800     $ 30,800     $ 30,800 $ 30,800
Current Property Ownership Status                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Number of communities owned 336     336     336 336
Operating and financing leases, number of communities 335     335     335 335
Number of communities managed       17        
Number of communities managed by third party 106     106     106 106