v3.26.1
Segment Reporting - Summary of Geographic Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Revenues:          
Amount $ 3,544,586 $ 2,548,244 $ 6,896,512 $ 4,971,331  
Resident fees and services 2,984,891 1,971,044 5,765,822 3,835,574  
Assets:          
Amount 69,875,180   69,875,180   $ 67,303,047 [1]
Operating Segments | Seniors Housing Operating          
Revenues:          
Amount 2,995,336 1,975,732 5,785,710 3,843,603  
Resident fees and services 2,984,891 1,971,044 5,765,822 3,835,574  
Assets:          
Amount 48,706,368   48,706,368   42,014,932
Operating Segments | Triple-net          
Revenues:          
Amount 414,841 273,754 806,953 528,784  
Resident fees and services 0 0 0 0  
Assets:          
Amount 14,241,534   14,241,534   13,448,058
Operating Segments | Outpatient Medical          
Revenues:          
Amount 45,768 211,811 116,900 422,827  
Resident fees and services 0 0 0 0  
Assets:          
Amount 1,914,978   1,914,978   3,322,225
Non-segment/Corporate          
Revenues:          
Amount 88,641 86,947 186,949 176,117  
Resident fees and services 0 0 0 0  
Assets:          
Amount 5,012,300   5,012,300   8,517,832
Resident fees and services          
Revenues:          
Resident fees and services 2,984,891 1,971,044 5,765,822 3,835,574  
United States          
Revenues:          
Amount 2,131,987 1,944,405 4,199,111 3,833,740  
Assets:          
Amount 44,645,290   44,645,290   43,536,068
United States | Resident fees and services          
Revenues:          
Resident fees and services 1,705,020 1,446,648 3,339,577 2,840,656  
United Kingdom          
Revenues:          
Amount 1,126,930 416,809 2,210,116 792,316  
Assets:          
Amount 18,120,480   18,120,480   18,056,095
United Kingdom | Resident fees and services          
Revenues:          
Resident fees and services 998,165 356,939 1,959,979 678,768  
Canada          
Revenues:          
Amount 285,669 187,030 487,285 345,275  
Assets:          
Amount 7,109,410   7,109,410   $ 5,710,884
Canada | Resident fees and services          
Revenues:          
Resident fees and services $ 281,706 $ 167,457 $ 466,266 $ 316,150  
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 60.10% 76.30% 60.90% 77.20%  
Revenue | United States | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 57.20% 73.40% 57.90% 74.10%  
Revenue | United Kingdom | Geographic Concentration Risk          
Assets:          
Percentage 31.80% 16.40% 32.00% 15.90%  
Revenue | United Kingdom | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 33.40% 18.10% 34.00% 17.70%  
Revenue | Canada | Geographic Concentration Risk          
Assets:          
Percentage 8.10% 7.30% 7.10% 6.90%  
Revenue | Canada | Resident fees and services | Geographic Concentration Risk          
Assets:          
Percentage 9.40% 8.50% 8.10% 8.20%  
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     69.70%   62.40%
Assets | Segment Concentration Risk | Operating Segments | Triple-net          
Assets:          
Percentage     20.40%   20.00%
Assets | Segment Concentration Risk | Operating Segments | Outpatient Medical          
Assets:          
Percentage     2.70%   4.90%
Assets | Segment Concentration Risk | Non-segment/Corporate          
Assets:          
Percentage     7.20%   12.70%
Assets | United States | Geographic Concentration Risk          
Assets:          
Percentage     63.90%   64.70%
Assets | United Kingdom | Geographic Concentration Risk          
Assets:          
Percentage     25.90%   26.80%
Assets | Canada | Geographic Concentration Risk          
Assets:          
Percentage     10.20%   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.