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Real Estate Transactions - MSREI MOB JV (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
property
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Real Estate [Line Items]      
Payments to acquire real estate     $ 21,000
Net real estate   $ 11,033,055 10,209,450
Finite-lived intangible assets acquired   $ 157,000  
MSREI MOB JV      
Real Estate [Line Items]      
Ownership percentage (as a percent) 51.00% 51.00%  
Proceeds from contributions from affiliates $ 298,000    
Number of properties contributed to joint venture | property 9    
Contribution of property $ 320,000    
Number of properties acquired | property 16    
Noncontrolling interest in variable interest entity     298,000
Greenville Portfolio | MSREI MOB JV      
Real Estate [Line Items]      
Payments to acquire real estate $ 285,000    
Term of operating leases 10 years    
Net real estate     276,000
Finite-lived intangible assets acquired     $ 20,000