Segment Reporting - Summary of Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Amount	$ 5,860,615	$ 4,742,115	$ 4,605,967
Assets:
Amount	37,893,233	34,910,325
Resident fees and services
Revenues:
Revenue from contract with customer	4,173,711	3,197,223	3,074,022
United States
Revenues:
Amount	4,843,417	3,766,707	3,720,155
Assets:
Amount	31,740,907	28,595,703
United States | Resident fees and services
Revenues:
Revenue from contract with customer	3,325,466	2,389,257	2,321,956
United Kingdom
Revenues:
Amount	558,308	552,650	451,399
Assets:
Amount	3,476,793	3,938,258
United Kingdom | Resident fees and services
Revenues:
Revenue from contract with customer	401,195	396,610	327,687
Canada
Revenues:
Amount	458,890	422,758	434,413
Assets:
Amount	2,675,533	2,376,364
Canada | Resident fees and services
Revenues:
Revenue from contract with customer	$ 447,050	$ 411,356	$ 424,379
Revenue | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%	100.00%
Revenue | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%	100.00%
Revenue | United States | Geographic Concentration Risk
Assets:
Percentage	82.60%	79.40%	80.80%
Revenue | United States | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	79.70%	74.70%	75.50%
Revenue | United Kingdom | Geographic Concentration Risk
Assets:
Percentage	9.50%	11.70%	9.80%
Revenue | United Kingdom | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	9.60%	12.40%	10.70%
Revenue | Canada | Geographic Concentration Risk
Assets:
Percentage	7.90%	8.90%	9.40%
Revenue | Canada | Resident fees and services | Geographic Concentration Risk
Assets:
Percentage	10.70%	12.90%	13.80%
Assets | Geographic Concentration Risk
Assets:
Percentage	100.00%	100.00%
Assets | United States | Geographic Concentration Risk
Assets:
Percentage	83.80%	81.90%
Assets | United Kingdom | Geographic Concentration Risk
Assets:
Percentage	9.20%	11.30%
Assets | Canada | Geographic Concentration Risk
Assets:
Percentage	7.00%	6.80%