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Real Estate and Lending Activities - Adeptus Health Transition Properties - Additional Information (Detail) - Adeptus Health [Member]
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Property
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Facility
Business Acquisition [Line Items]      
Number of facilities sever decline in operating results | Facility     20
Straight-line rent and other write-off, net of tax     $ 20.0
Proceeds from lease payments   $ 9.0  
Real estate impairment charge     $ 9.9
TEXAS      
Business Acquisition [Line Items]      
Number of re-leased properties | Property 2    
Maximum [Member]      
Business Acquisition [Line Items]      
Percentage of vacant on leased property 1.00%   1.00%
Acute Care Hospital [Member]      
Business Acquisition [Line Items]      
Number of facilities sever decline in operating results | Facility     1