Real Estate Activities - Summary of Status on Current Development Projects (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Commitment	$ 209,927
Costs Incurred as of December 31, 2019	168,212
Circle [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Commitment	47,532
Costs Incurred as of December 31, 2019	$ 41,920
Estimated Rent Commencement Date	2Q 2020
Circle Rehabilitation [Member] | Birmingham, England [Member]
Business Acquisition [Line Items]
Commitment	$ 21,427
Costs Incurred as of December 31, 2019	$ 17,385
Estimated Rent Commencement Date	2Q 2020
Surgery Partners [Member] | Idaho Falls, ID [Member]
Business Acquisition [Line Items]
Commitment	$ 113,468
Costs Incurred as of December 31, 2019	$ 96,639
Estimated Rent Commencement Date	1Q 2020
NeuroPsychiatric Hospitals [Member] | Houston, Texas [Member]
Business Acquisition [Line Items]
Commitment	$ 27,500
Costs Incurred as of December 31, 2019	$ 12,268
Estimated Rent Commencement Date	4Q 2020