Per Unit Data of HTALP (Details) $ / shares in Units, shares in Thousands, $ in Thousands		1 Months Ended		3 Months Ended								12 Months Ended
		Jun. 30, 2018 USD ($)	Oct. 31, 2017 shares	Dec. 31, 2019 USD ($) Arrangement $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Forward equity agreement, to be sold (in shares)												21,600	2,600
Forward equity agreements, number of arrangements | Arrangement				3
Stock issued, value, issued on a forward basis | $				$ 306,200								$ 629,500	$ 73,800
Numerator:
Net income | $												30,758	217,626	$ 65,577
Net income attributable to noncontrolling interests | $	[1]											(604)	(4,163)	(1,661)
Net income (loss) attributable to common stockholders/unitholders | $												$ 30,154	$ 213,463	$ 63,916
Denominator:
Weighted average shares/units outstanding - basic (in shares)												205,720	206,065	181,064
Dilutive effect of forward equity sales agreement (in shares)												0	0	17
Adjusted weighted average number of shares/units outstanding — diluted (in shares)												209,605	210,061	185,278
Earnings per common unit - basic:
Net income attributable to common stockholders/unitholders (in dollars per share) | $ / shares												$ 0.15	$ 1.04	$ 0.35
Earnings per common unit - diluted:
Net income attributable to common stockholders/unitholders (in dollars per share) | $ / shares												$ 0.14	$ 1.02	$ 0.34
Healthcare Trust of America Holdings, LP (HTALP)
Numerator:
Net income | $				9,036	$ (8,577)	$ 16,598	$ 13,701	$ 15,605	$ 176,348	$ 15,657	$ 10,016	$ 30,758	$ 217,626	$ 65,577
Net income attributable to noncontrolling interests | $												(66)	(89)	(123)
Net income (loss) attributable to common stockholders/unitholders | $				$ 9,036	$ (8,577)	$ 16,560	$ 13,673	$ 15,581	$ 176,330	$ 15,643	$ 9,983	$ 30,692	$ 217,537	$ 65,454
Denominator:
Weighted average shares/units outstanding - basic (in shares)												209,605	210,061	185,261
Dilutive effect of forward equity sales agreement (in shares)												0	0	17
Adjusted weighted average number of shares/units outstanding — diluted (in shares)												209,605	210,061	185,278
Earnings per common unit - basic:
Net income attributable to common stockholders/unitholders (in dollars per share) | $ / shares				$ 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 unit - diluted:
Net income attributable to common stockholders/unitholders (in dollars per share) | $ / shares				$ 0.04	$ (0.04)	$ 0.08	$ 0.07	$ 0.07	$ 0.83	$ 0.07	$ 0.05	$ 0.15	$ 1.04	$ 0.35
ATM Offering Program
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Forward equity agreement, to be sold (in shares)			2,600
Issuance of common stock (in shares)												11,100
Stock issued, value, issued on a forward basis | $		$ 73,800										$ 323,400

[1] Includes amounts attributable to redeemable noncontrolling interests.