Selected Quarterly Financial Data of HTALP (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Data [Line Items]
Revenues									$ 692,040	$ 696,426	$ 613,990
Net income (loss)									30,758	217,626	65,577
Net income (loss) attributable to common stockholders									$ 30,154	$ 213,463	$ 63,916
Earnings per common share/unit - basic:
Net income (loss) attributable to common stockholders/unitholders (in dollars per share)									$ 0.15	$ 1.04	$ 0.35
Earnings per common share/unit - diluted:
Net income (loss)attributable to common stockholders/unitholders (in dollars per share)									$ 0.14	$ 1.02	$ 0.34
Healthcare Trust of America Holdings, LP (HTALP)
Selected Quarterly Financial Data [Line Items]
Revenues	$ 176,313	$ 175,004	$ 171,757	$ 168,966	$ 172,298	$ 175,135	$ 173,332	$ 175,661	$ 692,040	$ 696,426	$ 613,990
Net income (loss)	9,036	(8,577)	16,598	13,701	15,605	176,348	15,657	10,016	30,758	217,626	65,577
Net income (loss) attributable to common stockholders	$ 9,036	$ (8,577)	$ 16,560	$ 13,673	$ 15,581	$ 176,330	$ 15,643	$ 9,983	$ 30,692	$ 217,537	$ 65,454
Earnings per common share/unit - basic:
Net income (loss) attributable to common stockholders/unitholders (in dollars per share)	$ 0.04	$ (0.04)	$ 0.08	$ 0.07	$ 0.07	$ 0.83	$ 0.07	$ 0.05	$ 0.15	$ 1.04	$ 0.35
Earnings per common share/unit - diluted:
Net income (loss)attributable to common stockholders/unitholders (in dollars per share)	$ 0.04	$ (0.04)	$ 0.08	$ 0.07	$ 0.07	$ 0.83	$ 0.07	$ 0.05	$ 0.15	$ 1.04	$ 0.35