Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Building Improvements
Partners' Capital Notes [Abstract]
Depreciation expense	$ 25.7	$ 23.3
Healthcare Trust of America Holdings, LP (HTALP)
Partners' Capital Notes [Abstract]
Limited partner's capital, units outstanding	1,833,849		1,929,942
Limited partner's capital, units issued	1,833,849		1,929,942
Healthcare Trust of America Holdings, LP (HTALP) | Noncontrolling Interest
Partners' Capital Notes [Abstract]
Limited partner's capital, units outstanding	1,800,000		1,900,000
Limited partner's capital, units issued	1,800,000		1,900,000