Real Estate and Lending Activities - Adeptus Health Transition Properties - Additional Information (Detail) - Adeptus Health Transition Properties [Member]		1 Months Ended	6 Months Ended
	Oct. 01, 2019 Property	Jul. 31, 2019 Property	Jun. 30, 2019 Property Facility
Business Acquisition [Line Items]
Number of facilities transitioned			16
Number of re-leased facilities			9
Number of transitioned facilities not re-leased | Facility			5
Percentage of investment in remaining transition facilities on total assets			0.50%
Subsequent Event [Member]
Business Acquisition [Line Items]
Number of properties sold		2
Scenario, Forecast [Member]
Business Acquisition [Line Items]
Number of remaining properties to be transitioned	4