Real Estate and Lending Activities - Adeptus Health Transition Properties - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) Facility	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Straight-line rent and other write-off, net of tax	$ 26,958	$ 3,002
Adeptus Health [Member]
Business Acquisition [Line Items]
Number of facilities sever decline in operating results | Facility	20
Straight-line rent and other write-off, net of tax	$ 20,000
Proceeds from lease payments	9,000
Real estate impairment charge	$ 9,900
Adeptus Health [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of vacant on leased property	1.00%
Adeptus Health [Member] | Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities sever decline in operating results | Facility	1