CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Healthcare Trust of America Holdings, LP (HTALP)
Partners’ Capital:
Limited partner's capital, units issued (in shares)	4,124,148	4,323,095
Limited partner's capital, units outstanding (in shares)	4,124,148	4,323,095
General partner's capital, units issued (in shares)	204,892,118	141,719,134
General partner's capital, units outstanding (in shares)	204,892,118	141,719,134
Class A Common Stock
Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	204,892,118	141,719,134
Common stock, shares outstanding (in shares)	204,892,118	141,719,134