Credit Concentration - Summary of Credit Concentration (Details) £ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) property	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) property	Jun. 30, 2022 USD ($)	Jun. 30, 2023 GBP (£) property	Dec. 31, 2022 USD ($)
Concentration Risk [Line Items]
Total NOI	$ 706,806	$ 618,453	$ 1,309,782	$ 1,160,488
Percentage total investments with top five customers						30.00%
Real estate loans receivable, net of credit allowance	$ 965,509		$ 965,509			$ 890,844	[1]
HC-One Group
Concentration Risk [Line Items]
Real estate loans receivable, net of credit allowance   | £					£ 525,471
Net operating income | Credit Concentration Risk
Concentration Risk [Line Items]
Number of Properties | property	1,778		1,778		1,778
Total NOI			$ 1,309,782
Percent of NOI			100.00%
Net operating income | Credit Concentration Risk | Integra Healthcare Properties
Concentration Risk [Line Items]
Number of Properties | property	147		147		147
Total NOI			$ 107,789
Percent of NOI			8.00%
Net operating income | Credit Concentration Risk | Sunrise Senior Living
Concentration Risk [Line Items]
Number of Properties | property	109		109		109
Total NOI			$ 86,025
Percent of NOI			7.00%
Net operating income | Credit Concentration Risk | Cogir Management Corporation
Concentration Risk [Line Items]
Number of Properties | property	48		48		48
Total NOI			$ 45,814
Percent of NOI			3.00%
Net operating income | Credit Concentration Risk | StoryPoint Senior Living
Concentration Risk [Line Items]
Number of Properties | property	75		75		75
Total NOI			$ 45,617
Percent of NOI			3.00%
Net operating income | Credit Concentration Risk | HC-One Group
Concentration Risk [Line Items]
Number of Properties | property	1		1		1
Total NOI			$ 41,559
Percent of NOI			3.00%
Net operating income | Credit Concentration Risk | Remaining portfolio
Concentration Risk [Line Items]
Number of Properties | property	1,398		1,398		1,398
Total NOI			$ 982,978
Percent of NOI			76.00%

[1] The consolidated balance sheet at December 31, 2022 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.