Segment Reporting - Summary of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 1,395,704	$ 1,052,062
Total assets	35,472,453		$ 34,910,325
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,139,016	825,648
Total assets	28,821,624		28,595,703
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	144,491	118,874
Total assets	3,822,998		3,938,258
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	112,197	$ 107,540
Total assets	$ 2,827,831		$ 2,376,364
Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	100.00%	100.00%
Revenue | United States | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	81.60%	78.50%
Revenue | United States | Geographic Concentration Risk | Resident fees and services
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	79.00%
Revenue | United Kingdom | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	10.40%	11.30%
Revenue | United Kingdom | Geographic Concentration Risk | Resident fees and services
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	10.00%
Revenue | Canada | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	8.00%	10.20%
Revenue | Canada | Geographic Concentration Risk | Resident fees and services
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	11.00%
Assets | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	100.00%		100.00%
Assets | United States | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	81.20%		81.90%
Assets | United Kingdom | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	10.80%		11.30%
Assets | Canada | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	8.00%		6.80%