Real Estate and Other Activities - Other Disposal Transactions - Additional Information (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) Operator	Dec. 31, 2021 USD ($) Facility Operator	Dec. 31, 2020 USD ($) Facility Property	Dec. 31, 2019 USD ($) Hospital
Business Acquisition [Line Items]
Number of operations sold | Operator	3	3
Proceeds from sale of facilities	$ 54,500	$ 246,000	$ 94
Gain (loss) on real estate dispositions	$ (40,000)	$ 52,500	$ (2,800)
Number of facilities sold | Facility		16	9
Number of properties sold | Property			6
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Gain (loss) on real estate dispositions				$ 41,600
Number of hospitals sold | Hospital				5