Debt Instrument, Maturity Period, Extension Option

No definition available.

Name:	hta_DebtInstrumentMaturityPeriodExtensionOption
Namespace Prefix:	hta_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Percentage of Principal Amount Received

+ References

No definition available.

+ Details

Name:	hta_DebtInstrumentPercentageOfPrincipalAmountReceived
Namespace Prefix:	hta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt, Weighted Average Interest Rate with Interest Rate Swap Impact

+ References

No definition available.

+ Details

Name:	hta_DebtWeightedAverageInterestRatewithInterestRateSwapImpact
Namespace Prefix:	hta_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hta_ThreeHundredMillionUnsecuredTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hta_OneHundredFiftyFiveMillionUnsecuredTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hta_UnsecuredSeniorNotesDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hta_UnsecuredSeniorNotesDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Textuals (Details) - USD ($)	9 Months Ended
Debt - Textuals (Details) - USD ($)	Sep. 30, 2015	Feb. 11, 2015	Dec. 31, 2014	Nov. 19, 2014
Debt Instrument
Outstanding amount	$ 1,576,724,000		$ 1,412,873,000
Unsecured Term Loans
Debt Instrument
Outstanding amount	$ 455,000,000		355,000,000
Unsecured Term Loans \| $300.0 Million Unsecured Term Loan
Debt Instrument
Basis spread on variable rate	1.15%
Outstanding amount	$ 300,000,000
Additional borrowings	$ 100,000,000
Weighted average interest rate with interest rate swap impact	1.56%
Unsecured credit agreement, extension option period	1 year
Unsecured Term Loans \| $300.0 Million Unsecured Term Loan \| Minimum
Debt Instrument
Basis spread on variable rate	0.90%
Unsecured Term Loans \| $300.0 Million Unsecured Term Loan \| Maximum
Debt Instrument
Basis spread on variable rate	1.80%
Unsecured Term Loans \| $155.0 Million Unsecured Term Loan
Debt Instrument
Basis spread on variable rate	1.70%
Weighted average interest rate with interest rate swap impact	2.99%
Debt instrument, face amount	$ 155,000,000
Unsecured Term Loans \| $155.0 Million Unsecured Term Loan \| Minimum
Debt Instrument
Basis spread on variable rate	1.55%
Unsecured Term Loans \| $155.0 Million Unsecured Term Loan \| Maximum
Debt Instrument
Basis spread on variable rate	2.40%
Unsecured Senior Notes
Debt Instrument
Outstanding amount	$ 600,000,000		$ 600,000,000
Unsecured Senior Notes \| $300.0 Million Unsecured Senior Notes Due 2021
Debt Instrument
Debt instrument, face amount	$ 300,000,000
Debt instrument, stated interest rate	3.38%
Debt instrument, percentage of principal amount received	99.21%
Debt instrument, effective interest rate	3.50%
Unsecured Senior Notes \| $300.0 Million Unsecured Senior Notes Due 2023
Debt Instrument
Debt instrument, face amount	$ 300,000,000
Debt instrument, stated interest rate	3.70%
Debt instrument, percentage of principal amount received	99.19%
Debt instrument, effective interest rate	3.80%
Mortgages
Debt Instrument
Weighted average interest rate with interest rate swap impact	5.61%
Effective percentage rate range, minimum	1.64%
Effective percentage rate range, maximum	6.49%
Weighted average interest rate	5.33%
Unsecured Revolving Credit Facility
Debt Instrument
Line of credit facility, borrowing capacity		$ 850,000,000		$ 800,000,000
Basis spread on variable rate	1.05%
Line of credit facility, commitment fee percentage	0.20%
Unsecured Revolving Credit Facility \| Minimum
Debt Instrument
Basis spread on variable rate	0.875%
Line of credit facility, commitment fee percentage	0.125%
Unsecured Revolving Credit Facility \| Maximum
Debt Instrument
Basis spread on variable rate	1.55%
Line of credit facility, commitment fee percentage	0.30%