Real Estate and Other Activities - Net Assets Acquired (Parenthetical) (Detail) $ in Thousands, £ in Millions		12 Months Ended
		Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 GBP (£)
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible lease assets (in years)		23 years 6 months
Advanced to the mortgage loan | $	[1]	$ 0	$ 22,900	$ 0
Mortgage Loans [Member] | Springstone Health Opco, LLC [Member]
Business Acquisition [Line Items]
Advanced to the mortgage loan | £					£ 23
Intangible Lease Assets [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible lease assets (in years)			24 years 9 months 18 days	21 years 3 months 18 days

[1] The 2023 column includes a $23 million mortgage loan that was converted to fee simple ownership of one property as described under the Lifepoint Transaction below.