Real Estate and Lending Activities - Adeptus Health Transition Properties - Additional Information (Detail) - Adeptus Health Transition Properties [Member]		1 Months Ended	3 Months Ended
	Oct. 01, 2019 Property	Apr. 30, 2019 Property	Mar. 31, 2019 Property Facility
Business Acquisition [Line Items]
Number of facilities transitioned			16
Number of re-leased properties			9
Number of transitioned facilities not re-leased | Facility			6
Percentage of investment in remaining transition facilities on total assets			0.60%
Scenario, Forecast [Member]
Business Acquisition [Line Items]
Number of remaining properties to be transitioned	5
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of properties sold		1