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Real Estate and Lending Activities - 2018 Activity - Additional Information (Detail)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 27, 2018
USD ($)
RenewalOption
Hospital
Oct. 31, 2016
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]        
Payment of cash consideration for acquisition     $ 273,728 $ 600,781
2018 [Member] | General Acute Care Hospital and Healthcare System [Member]        
Business Acquisition [Line Items]        
Term of lease 15 years      
Number of lease extension options | RenewalOption 3      
Term of lease extension, years 5 years      
Number of facilities acquired | Hospital 2      
Mortgage financing   $ 259,400    
Payment of cash consideration for acquisition $ 14,400