Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Equity:
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000,000	200,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A
Equity:
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	238,944,761	236,880,614
Common stock, shares outstanding	238,944,761	236,880,614
Healthcare Trust of America Holdings, LP (HTALP)
Partners’ Capital:
Limited partner's capital, units issued	2,973,998	3,052,918
Limited partner's capital, units outstanding	2,973,998	3,052,918
General partner's capital, units issued	238,944,761	236,880,614
General partner's capital, units outstanding	238,944,761	236,880,614