Summary of Significant Accounting Policies (Details) $ in Thousands, shares in Millions, ft² in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) ft² variable_interest_entity property building state financing_receivable shares	Sep. 30, 2022 USD ($) ft² variable_interest_entity property building state financing_receivable shares	Dec. 31, 2021 USD ($) building
Business Overview:
Gross investment amount, total	$ 14,200,000	$ 14,200,000
Number of real estate properties | property	695	695
Number of states that the company owns real estate in, whole units | state	35	35
Approximate square feet invested in by company | ft²	40.7	40.7
Approximate square feet for which Nationwide property management services provided by company | ft²	38.9	38.9
Number of buildings owned by joint venture with TIAA | building	33	33
Number of variable interest entities | variable_interest_entity	3	3
Number of consolidated variable interest entities | variable_interest_entity	2	2
Number of unconsolidated variable interest entities | property	1	1
Limited partner's capital, units issued (in shares) | shares	4.0	4.0
Limited partner's capital, units outstanding (in shares) | shares	4.0	4.0
OP Units, issued and outstanding, held by non-controlling interest holders (percent)	1.10%	1.10%
Equity ownership for consolidation (percent)	100.00%	100.00%
Leases [Abstract]
Real estate notes receivable, net	$ 79,036	$ 79,036	$ 0
Number of recognized lease financial receivables | financing_receivable	2	2
Sales-type Lease, Interest Income, Lease Receivable	$ 2,000	$ 5,900
Real Estate Properties Held in Joint Ventures
Business Overview:
Joint venture ownership (percent)	49.00%	49.00%
Notes Receivable
Leases [Abstract]
Interest income	$ 1,300	$ 1,300
Nashville, Tennessee | Medical office building
Leases [Abstract]
Number of buildings acquired in sale leaseback transactions | building			2
Buildings acquired in sale leaseback transactions	$ 73,900	$ 73,900