Segment Reporting - Summary of Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 1,472,536	$ 1,140,992	$ 2,868,240	$ 2,193,054
Total assets	36,573,671		36,573,671		$ 34,910,325	[1]
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,218,879	893,672	2,357,895	1,719,320
Total assets	30,181,095		30,181,095		28,595,703
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	139,352	140,756	283,843	259,630
Total assets	3,519,917		3,519,917		3,938,258
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	114,305	$ 106,564	226,502	$ 214,104
Total assets	$ 2,872,659		$ 2,872,659		$ 2,376,364
Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	100.00%	100.00%	100.00%	100.00%
Revenue | United States | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	82.70%	78.40%	82.20%	78.40%
Revenue | United Kingdom | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	9.50%	12.30%	9.90%	11.80%
Revenue | Canada | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	7.80%	9.30%	7.90%	9.80%
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			82.50%		81.90%
Assets | United Kingdom | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage			9.60%		11.30%
Assets | Canada | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage			7.90%		6.80%
Resident fees and services | Revenue | United States | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	79.00%		79.00%
Resident fees and services | Revenue | United Kingdom | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	10.00%		10.00%
Resident fees and services | Revenue | Canada | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage	11.00%		11.00%

[1] The consolidated balance sheet at December 31, 2021 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.