Real Estate and Other Activities - Disposals - 2022 Activity Additional Information (Detail) $ in Millions				3 Months Ended	12 Months Ended
	May 18, 2023 Facility	Sep. 01, 2022 USD ($) Property	Mar. 14, 2022 USD ($) Facility	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) Property Facility	Dec. 31, 2021 USD ($) Facility
Debt Instrument [Line Items]
Number of facilities sold | Facility	7				15	16
Proceeds from sale of facilities				$ 54.5	$ 522.0	$ 246.0
Number of ancillary properties sold | Property					5
Gain (loss) on real estate dispositions				$ 40.0	$ 100.0	$ 52.5
Disposal Group, Not Discontinued Operations [Member]
Debt Instrument [Line Items]
Straight-line rent write-offs					$ 42.0
Massachusetts-based General Acute Care Hospitals [Member]
Debt Instrument [Line Items]
Number of facilities acquired | Facility			8
Purchase price of acquisition			$ 1,700.0
Gain (loss) on real estate dispositions			$ 600.0
Prime Healthcare Services, Inc. Facilities [Member]
Debt Instrument [Line Items]
Number of properties sold | Property		11
Proceeds from sale of facilities		$ 366.0