Leases - Schedule of Leasing Arrangement (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets [Abstract]
Operating lease right-of-use assets	$ (732,918)	$ (670,907)
Total assets	5,939,123	5,573,435
Liabilities [Abstract]
Financing lease obligations	603,900
Operating lease obligations	(881,200)
Total liabilities	5,644,801	$ 5,168,282
Welltower Inc. and JV
Assets [Abstract]
Property, plant and equipment and leasehold intangibles, net	281,000
Operating lease right-of-use assets	(52,000)
Total assets	229,000
Liabilities [Abstract]
Financing lease obligations	300,000
Operating lease obligations	(71,000)
Total liabilities	229,000
Diversified Healthcare Trust
Assets [Abstract]
Property, plant and equipment and leasehold intangibles, net	128,600
Operating lease right-of-use assets	(40,400)
Total assets	88,200
Liabilities [Abstract]
Financing lease obligations	135,000
Operating lease obligations	(46,800)
Total liabilities	$ 88,200