Leases - Narrative (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($) community lease	Jun. 30, 2023 USD ($) community lease	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) community lease	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Lessee, Lease, Description [Line Items]
Operating and financing leases, number of communities | community	295			295
Operating lease, number of communities | lease	281			281
Financing leases, number of communities | lease	14			14
Operating lease right-of-use assets	$ 3,800		$ 1,900	$ 3,800	$ 11,500
Operating lease expense	7,200			12,000
Operating lease right-of-use assets	707,434			707,434		$ 597,130
Mortgages
Lessee, Lease, Description [Line Items]
Operating lease, covenant provisions, required minimum tangible net worth		$ 2,000,000
Welltower Inc.
Lessee, Lease, Description [Line Items]
Number of communities Company continues to lease | community		74
Number of communities leased | community		69
Operating leases, maximum fund costs		$ 17,000
Operating lease right-of-use assets	$ 122,300			$ 122,300
Operating lease, covenant provisions, required minimum stockholders equity		400,000
Welltower Inc. | Mortgages
Lessee, Lease, Description [Line Items]
Operating lease, covenant provisions, required minimum tangible net worth		$ 1,500,000
Welltower Inc. | Revision of Prior Period, Reclassification, Adjustment
Lessee, Lease, Description [Line Items]
Number of communities leased | community				35
Lease, cost				$ 19,300
Welltower Inc. | Lease Expire From December 31, 2026 Until June 30, 2032
Lessee, Lease, Description [Line Items]
Number of leases extended | lease		1
Number of communities leased | community		39
Welltower Inc. | Lease Expire On June 30, 2032
Lessee, Lease, Description [Line Items]
Number of communities leased | community		69
Welltower Inc. | Lease Expire On December 31, 2024
Lessee, Lease, Description [Line Items]
Number of communities leased | community		5
Welltower Inc. | Minimum Rent Leasing Arrangement | SOFR
Lessee, Lease, Description [Line Items]
Annual escalator rate (as percent)		4.00%
Minimum
Lessee, Lease, Description [Line Items]
Finance and operating lease, renewal term (in years)				5 years
Minimum | Welltower Inc. | Minimum Rent Leasing Arrangement | SOFR
Lessee, Lease, Description [Line Items]
Annual escalator rate (as percent)		3.00%
Maximum
Lessee, Lease, Description [Line Items]
Finance and operating lease, renewal term (in years)				20 years