Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 24, 2017
Entity Information [Line Items]
Entity Registrant Name	HEALTHCARE TRUST OF AMERICA, INC.
Entity Central Index Key	0001360604
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		143,841,711
Healthcare Trust of America Holdings, LP (HTALP)
Entity Information [Line Items]
Entity Registrant Name	Healthcare Trust of America Holdings, LP
Entity Central Index Key	0001495491
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer