Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) property shares	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) property shares	Dec. 31, 2020 USD ($)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 10,944	$ 29,990	$ 52,353
Restricted cash	4,478	3,096	4,716
Total cash, cash equivalents and restricted cash	15,422	33,086	$ 57,069	$ 118,765
Leases [Abstract]
Expected credit losses	0
Real estate notes receivable, net	72,700
Interest income	$ 1,759	143
Unconsolidated Joint Ventures [Abstract]
Investment in unconsolidated joint ventures, ownership percentage	50.00%		50.00%
Investment in unconsolidated joint venture	$ 62,454		$ 62,834
Income (loss) from unconsolidated joint venture	400	392
Notes Receivable
Leases [Abstract]
Interest income	$ 1,600
Disposal Group, Held-for-sale
Leases [Abstract]
Number of properties in portfolio | property	0		1
Minimum
Leases [Abstract]
Lessor, term of contract	3 years
Maximum
Leases [Abstract]
Lessor, term of contract	7 years
Building and Building Improvements
Real estate investments [Abstract]
Depreciation expense	$ 62,300	61,200
Healthcare Trust of America Holdings, LP (HTALP)
Partners' Capital Notes [Abstract]
Limited partner's capital, units issued (in shares) | shares	4,050,493		4,142,408
Limited partner's capital, units outstanding (in shares) | shares	4,050,493		4,142,408
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 10,944		$ 52,353
Restricted cash	4,478		4,716
Total cash, cash equivalents and restricted cash	15,422	33,086	57,069	$ 118,765
Leases [Abstract]
Interest income	1,759	143
Unconsolidated Joint Ventures [Abstract]
Investment in unconsolidated joint venture	62,454		$ 62,834
Income (loss) from unconsolidated joint venture	$ 400	$ 392