Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 216,515	$ 61,073	$ 32,713
Restricted cash		4,957	7,402	4,903
Total cash, cash equivalents and restricted cash		221,472	68,475	$ 37,616	$ 133,530
Leases [Abstract]
Net income attributable to noncontrolling interests	[1]	$ 307	261
Unconsolidated Joint Ventures [Abstract]
Investment in unconsolidated joint ventures, ownership percentage		50.00%		50.00%
Investment in unconsolidated joint venture		$ 65,526		$ 65,888
Income (loss) from unconsolidated joint venture		$ 422	486
Secured Debt
Real estate investments [Abstract]
Debt term		1 year
Debt instrument, face amount		$ 6,000
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		$ 58,900	52,100
Healthcare Trust of America Holdings, LP (HTALP)
Partners' Capital Notes [Abstract]
Limited partner's capital, units issued (in shares)		3,561,260		3,834,279
Limited partner's capital, units outstanding (in shares)		3,561,260		3,834,279
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents		$ 216,515		$ 32,713
Restricted cash		4,957		4,903
Total cash, cash equivalents and restricted cash		221,472	68,475	37,616	$ 133,530
Leases [Abstract]
Net income attributable to noncontrolling interests		0	28
Unconsolidated Joint Ventures [Abstract]
Investment in unconsolidated joint venture		65,526		$ 65,888
Income (loss) from unconsolidated joint venture		$ 422	$ 486

[1] Includes amounts attributable to redeemable noncontrolling interests for the three months ended March 31, 2019.