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Subsequent Events - Additional Information (Detail)
$ in Millions
May 10, 2019
USD ($)
Property
Mar. 31, 2019
Property
Subsequent Event [Line Items]    
Number of properties owned | Property   3
Subsequent Event    
Subsequent Event [Line Items]    
Repayment of debt | $ $ 5.6  
Subsequent Event | Seniors Housing Properties    
Subsequent Event [Line Items]    
Number of properties owned | Property 2  
Medical Office Building, Mid America Surgery Institute | Subsequent Event | Discontinued Operations, Held-for-sale    
Subsequent Event [Line Items]    
Net sales proceeds | $ $ 15.4