Real Estate and Lending Activities - Summary of Status on Current Development Projects (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Commitment	$ 75,429
Costs Incurred as of June 30, 2020	27,674
NeuroPsychiatric Hospitals [Member] | Houston, Texas [Member]
Business Acquisition [Line Items]
Commitment	27,500
Costs Incurred as of June 30, 2020	$ 16,586
Estimated Rent Commencement Date	4Q 2020
Ernest [Member] | Bakersfield, California [Member]
Business Acquisition [Line Items]
Commitment	$ 47,929
Costs Incurred as of June 30, 2020	$ 11,088
Estimated Rent Commencement Date	4Q 2021