v3.26.3
Segment Reporting - Summary of Geographic Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Revenues:          
Amount $ 3,715,777 $ 2,685,692 $ 10,612,289 $ 7,657,023  
Resident fees and services 3,121,141 2,061,370 8,886,963 5,896,944  
Assets:          
Amount 73,711,333   73,711,333   $ 67,303,047 [1]
Operating Segments | Seniors Housing Operating          
Revenues:          
Amount 3,125,101 2,063,618 8,897,015 5,904,104  
Resident fees and services 3,121,141 2,061,370 8,886,963 5,896,944  
Assets:          
Amount 51,578,575   51,578,575   41,992,500
Operating Segments | Triple-net          
Revenues:          
Amount 452,073 286,637 1,259,026 815,421  
Resident fees and services 0 0 0 0  
Assets:          
Amount 14,870,584   14,870,584   13,448,058
Operating Segments | Outpatient Medical          
Revenues:          
Amount 37,551 215,172 154,451 637,999  
Resident fees and services 0 0 0 0  
Assets:          
Amount 1,829,792   1,829,792   3,322,225
Non-segment/Corporate          
Revenues:          
Amount 101,052 120,265 301,797 299,499  
Resident fees and services 0 0 0 0  
Assets:          
Amount 5,432,382   5,432,382   8,540,264
Resident fees and services          
Revenues:          
Resident fees and services 3,121,141 2,061,370 8,886,963 5,896,944  
United States          
Revenues:          
Amount 2,263,412 2,044,666 6,462,523 5,878,406  
Assets:          
Amount 47,213,396   47,213,396   43,536,068
United States | Resident fees and services          
Revenues:          
Resident fees and services 1,809,855 1,499,789 5,149,432 4,340,445  
United Kingdom          
Revenues:          
Amount 1,157,782 448,018 3,367,898 1,240,334  
Assets:          
Amount 18,288,356   18,288,356   18,056,095
United Kingdom | Resident fees and services          
Revenues:          
Resident fees and services 1,023,522 388,021 2,983,501 1,066,789  
Canada          
Revenues:          
Amount 294,583 193,008 781,868 538,283  
Assets:          
Amount 8,209,581   8,209,581   $ 5,710,884
Canada | Resident fees and services          
Revenues:          
Resident fees and services $ 287,764 $ 173,560 $ 754,030 $ 489,710  
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 60.90% 76.10% 60.90% 76.80%  
Revenue | United States | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 58.00% 72.80% 57.90% 73.60%  
Revenue | United Kingdom | Geographic Concentration Risk          
Assets:          
Percentage 31.20% 16.70% 31.70% 16.20%  
Revenue | United Kingdom | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 32.80% 18.80% 33.60% 18.10%  
Revenue | Canada | Geographic Concentration Risk          
Assets:          
Percentage 7.90% 7.20% 7.40% 7.00%  
Revenue | Canada | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 9.20% 8.40% 8.50% 8.30%  
Assets | Geographic Concentration Risk          
Assets:          
Percentage     100.00%   100.00%
Assets | Segment Concentration Risk          
Assets:          
Percentage     100.00%   100.00%
Assets | Segment Concentration Risk | Operating Segments | Seniors Housing Operating          
Assets:          
Percentage     70.00%   62.40%
Assets | Segment Concentration Risk | Operating Segments | Triple-net          
Assets:          
Percentage     20.20%   20.00%
Assets | Segment Concentration Risk | Operating Segments | Outpatient Medical          
Assets:          
Percentage     2.50%   4.90%
Assets | Segment Concentration Risk | Non-segment/Corporate          
Assets:          
Percentage     7.40%   12.70%
Assets | United States | Geographic Concentration Risk          
Assets:          
Percentage     64.10%   64.70%
Assets | United Kingdom | Geographic Concentration Risk          
Assets:          
Percentage     24.80%   26.80%
Assets | Canada | Geographic Concentration Risk          
Assets:          
Percentage     11.10%   8.50%
[1] The consolidated balance sheet at December 31, 2025 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.