Real Estate and Lending Activities - Adeptus Health - Additional Information (Detail) - Adeptus Health [Member] $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) Facility Property
Business Acquisition [Line Items]
Number of facilities transitioned | Property	16
Number of transitioned facilities re-leased or sold to other tenants	14
Number of transitioned facilities remaining | Property	2
Remaining transitioned facilities, value | $	$ 3.0
Number of leased properties	21
Number of facilities sever decline in operating results	15
Number of facilities rent increased due to decline in operating results	6
Real estate impairment charge | $	$ 9.9
Maximum [Member]
Business Acquisition [Line Items]
Percentage of investment in remaining transition facilities on total assets	0.30%
Letter of Credit [Member]
Business Acquisition [Line Items]
Proceeds from lease payments | $	$ 9.1