Investments in Real Estate - Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Investments [Abstract]
Aggregate purchase price	$ 41,672	$ 18,826
Closing costs	$ 200

Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Including Other, Net

No definition available.

Name:	hta_AssetAcquisitionRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIncludingOtherNet
Namespace Prefix:	hta_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant