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Leases - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Lessee, Lease, Description [Line Items]    
Straight line rent adjustment   $ 49,241
Rental and other revenues related to operating lease payments $ 356,390 302,843
Rental and other revenues related to operating lease payments, variable leases 48,074 46,026
Resident fees and services    
Lessee, Lease, Description [Line Items]    
Revenue from contract with customer 994,335 723,464
Resident fees and services | Seniors Housing Operating    
Lessee, Lease, Description [Line Items]    
Revenue from contract with customer $ 94,827 $ 15,771
Minimum    
Lessee, Lease, Description [Line Items]    
Lease term extension period 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Lease term extension period 25 years