Investments in Real Estate - Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments [Abstract]
Aggregate purchase price	$ 560,456	$ 17,836	$ 2,740,231
Closing costs	$ 2,500

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