Segment Reporting - Summary of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues [Abstract]
Amount	$ 1,560,729	$ 1,395,704
Assets:
Amount	38,493,889		$ 37,893,233	[1]
Resident fees and services
Revenues [Abstract]
Revenue from contract with customer	1,131,685	994,335
United States
Revenues [Abstract]
Amount	1,296,022	1,139,016
Assets:
Amount	32,325,218		31,740,907
United States | Resident fees and services
Revenues [Abstract]
Revenue from contract with customer	908,944	784,097
United Kingdom
Revenues [Abstract]
Amount	147,876	144,491
Assets:
Amount	3,518,034		3,476,793
United Kingdom | Resident fees and services
Revenues [Abstract]
Revenue from contract with customer	109,012	101,090
Canada
Revenues [Abstract]
Amount	116,831	112,197
Assets:
Amount	2,650,637		$ 2,675,533
Canada | Resident fees and services
Revenues [Abstract]
Revenue from contract with customer	$ 113,729	$ 109,148
Revenue | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%
Revenue | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%
Revenue | United States | Geographic Concentration Risk
Assets:
Percentage	83.00%	81.60%
Revenue | United States | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	80.40%	78.80%
Revenue | United Kingdom | Geographic Concentration Risk
Assets:
Percentage	9.50%	10.40%
Revenue | United Kingdom | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	9.60%	10.20%
Revenue | Canada | Geographic Concentration Risk
Assets:
Percentage	7.50%	8.00%
Revenue | Canada | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	10.00%	11.00%
Assets | Geographic Concentration Risk
Assets:
Percentage	100.00%		100.00%
Assets | United States | Geographic Concentration Risk
Assets:
Percentage	84.00%		83.80%
Assets | United Kingdom | Geographic Concentration Risk
Assets:
Percentage	9.10%		9.20%
Assets | Canada | Geographic Concentration Risk
Assets:
Percentage	6.90%		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.