Segment Reporting - Summary of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Revenues [Abstract]
Amount	$ 1,665,478	$ 1,472,536	$ 3,226,207	$ 2,868,240
Assets:
Amount	40,064,135		40,064,135		$ 37,893,233	[1]
Resident fees and services
Revenues [Abstract]
Non-cash consideration	1,159,449	1,009,999	2,291,134	2,004,334
United States
Revenues [Abstract]
Amount	1,392,512	1,218,879	2,688,534	2,357,895
Assets:
Amount	33,868,263		33,868,263		31,740,907
United States | Resident fees and services
Revenues [Abstract]
Non-cash consideration	929,997	798,825	1,838,941	1,582,922
United Kingdom
Revenues [Abstract]
Amount	154,028	139,352	301,904	283,843
Assets:
Amount	3,468,475		3,468,475		3,476,793
United Kingdom | Resident fees and services
Revenues [Abstract]
Non-cash consideration	113,585	99,626	222,597	200,716
Canada
Revenues [Abstract]
Amount	118,938	114,305	235,769	226,502
Assets:
Amount	2,727,397		2,727,397		$ 2,675,533
Canada | Resident fees and services
Revenues [Abstract]
Non-cash consideration	$ 115,867	$ 111,548	$ 229,596	$ 220,696
Revenue | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%	100.00%	100.00%
Revenue | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%	100.00%	100.00%
Revenue | United States | Geographic Concentration Risk
Assets:
Percentage	83.70%	82.70%	83.30%	82.20%
Revenue | United States | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	80.20%	79.10%	80.30%	79.00%
Revenue | United Kingdom | Geographic Concentration Risk
Assets:
Percentage	9.20%	9.50%	9.40%	9.90%
Revenue | United Kingdom | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	9.80%	9.90%	9.70%	10.00%
Revenue | Canada | Geographic Concentration Risk
Assets:
Percentage	7.10%	7.80%	7.30%	7.90%
Revenue | Canada | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	10.00%	11.00%	10.00%	11.00%
Assets | Geographic Concentration Risk
Assets:
Percentage			100.00%		100.00%
Assets | United States | Geographic Concentration Risk
Assets:
Percentage			84.50%		83.80%
Assets | United Kingdom | Geographic Concentration Risk
Assets:
Percentage			8.70%		9.20%
Assets | Canada | Geographic Concentration Risk
Assets:
Percentage			6.80%		7.00%

[1] The consolidated balance sheet at December 31, 2022 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.