Per Unit Data of HTALP (Details) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) Arrangement $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares
Numerator:
Net (loss) income		$ (6,932)			$ (8,577)			$ 25,001	$ 21,722
Net loss (income) attributable to noncontrolling interests	[1]	105			114			(438)	(486)
Net (loss) income attributable to common stockholders/unitholders		$ (6,827)			$ (8,463)			$ 24,563	$ 21,236
Denominator:
Weighted average shares/units outstanding - basic (in shares) | shares		218,549			205,277			217,911	205,156
Dilutive shares - partnership units convertible into common stock (in shares) | shares		0			0			3,610	3,870
Adjusted weighted average number of shares/units outstanding — diluted (in shares) | shares		218,549			205,277			221,521	209,026
Earnings per common unit - basic:
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		$ (0.03)			$ (0.04)			$ 0.11	$ 0.10
Earnings per common unit - diluted:
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		(0.03)			$ (0.04)			$ 0.11	$ 0.10
Forward Sale Arrangements
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of arrangements | Arrangement								4
Anticipated proceeds of share issuance								$ 277,500
Forward Sale Arrangements Maturing in 2021
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of arrangements | Arrangement								4
Common Stock | ATM Offering Program
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Issuance of common stock, net (in shares) | shares								1,700
Proceeds from sale of stock								$ 50,000
Net price per share (in dollars per share) | $ / shares		$ 29.86						$ 29.86
Healthcare Trust of America Holdings, LP (HTALP)
Numerator:
Net (loss) income		$ (6,932)			$ (8,577)			$ 25,001	$ 21,722
Net loss (income) attributable to noncontrolling interests		0			0			0	(66)
Net (loss) income attributable to common stockholders/unitholders		$ (6,932)	$ 13,725	$ 18,208	$ (8,577)	$ 16,560	$ 13,673	$ 25,001	$ 21,656
Denominator:
Weighted average shares/units outstanding - basic (in shares) | shares		222,101			209,164			221,521	209,056
Dilutive shares - partnership units convertible into common stock (in shares) | shares		0			0			0	0
Adjusted weighted average number of shares/units outstanding — diluted (in shares) | shares		222,101			209,164			221,521	209,056
Earnings per common unit - basic:
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		$ (0.03)			$ (0.04)			$ 0.11	$ 0.10
Earnings per common unit - diluted:
Net (loss) income attributable to common stockholders/unitholders (in dollars per share) | $ / shares		$ (0.03)			$ (0.04)			$ 0.11	$ 0.10

[1] Includes amounts attributable to redeemable noncontrolling interests for the nine months ended September 30, 2019.