Debt Instrument, Percentage of Principal Amount Received

No definition available.

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- Definition

Debt, Weighted Average Interest Rate with Interest Rate Swap Impact

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Life Of Credit Facility, Maximum Borrowing Capacity, Aggregate Conditional Total

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Life Of Credit Facility, Maximum Borrowing Capacity, Conditional Increase

+ References

No definition available.

+ Details

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Namespace Prefix:	hta_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

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

+ Details

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

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Debt - Narrative (Details) - USD ($)		3 Months Ended
Debt - Narrative (Details) - USD ($)	Aug. 01, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Outstanding amount		$ 2,560,834,000	$ 2,561,421,000
Unsecured term loans
Debt Instrument
Outstanding amount		500,000,000	500,000,000
Unsecured term loans \| $300.0 Million Unsecured Term Loan due 2023
Debt Instrument
Outstanding amount		$ 300,000,000.0		$ 300,000,000.0
Basis spread on variable rate		1.10%
Weighted average interest rate with interest rate swap impact		3.65%
Unsecured term loans \| $300.0 Million Unsecured Term Loan due 2023 \| LIBOR \| Minimum
Debt Instrument
Basis spread on variable rate		0.90%
Unsecured term loans \| $300.0 Million Unsecured Term Loan due 2023 \| LIBOR \| Maximum
Debt Instrument
Basis spread on variable rate		1.75%
Unsecured term loans \| $200.0 Million Unsecured Term Loan due 2024 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Outstanding amount		$ 200,000,000.0
Basis spread on variable rate	0.65%	1.00%
Weighted average interest rate with interest rate swap impact		2.77%
Debt instrument, face amount		$ 200,000,000.0
Unsecured term loans \| $200.0 Million Unsecured Term Loan due 2024 \| LIBOR \| Minimum \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Basis spread on variable rate		0.75%
Unsecured term loans \| $200.0 Million Unsecured Term Loan due 2024 \| LIBOR \| Maximum \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Basis spread on variable rate		1.65%
Unsecured senior notes
Debt Instrument
Outstanding amount		$ 1,850,000,000	$ 1,850,000,000
Unsecured senior notes \| $300.0 Million Unsecured Senior Notes due 2021 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Outstanding amount		300,000,000.0
Debt instrument, face amount		$ 300,000,000.0
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 \| $400.0 Million Unsecured Senior Notes due 2022 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Outstanding amount		$ 400,000,000.0
Debt instrument, face amount				$ 400,000,000.0
Debt instrument, stated interest rate				2.95%
Debt instrument, percentage of principal amount received				99.94%
Debt instrument, effective interest rate				2.96%
Unsecured senior notes \| $500.0 Million Unsecured Senior Notes due 2027 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Outstanding amount		500,000,000.0
Debt instrument, face amount				$ 500,000,000.0
Debt instrument, stated interest rate				3.75%
Debt instrument, percentage of principal amount received				99.49%
Debt instrument, effective interest rate				3.81%
Unsecured senior notes \| $300.0 Million Unsecured Senior Notes due 2023 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Debt instrument, face amount		$ 300,000,000.0
Debt instrument, stated interest rate		3.70%
Debt instrument, percentage of principal amount received		99.19%
Debt instrument, effective interest rate		3.80%
Unsecured senior notes \| $350.0 Million Unsecured Senior Notes due 2026 \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Debt instrument, face amount		$ 350,000,000.0
Debt instrument, stated interest rate		3.50%
Debt instrument, percentage of principal amount received		99.72%
Debt instrument, effective interest rate		3.53%
Mortgages \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Weighted average interest rate		3.96%
Mortgages \| Minimum \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Debt instrument, effective interest rate		2.85%
Mortgages \| Maximum \| Healthcare Trust of America Holdings, LP (HTALP)
Debt Instrument
Debt instrument, effective interest rate		4.00%
Unsecured revolving credit facility
Debt Instrument
Line of credit facility, borrowing capacity				$ 1,300,000,000
Maximum borrowing capacity, conditional increase				750,000,000.0
Conditional maximum borrowing capacity				2,050,000,000.00
Basis spread on variable rate		1.00%
Line of credit facility, commitment fee		0.20%
Unsecured revolving credit facility \| Minimum
Debt Instrument
Line of credit facility, commitment fee		0.13%
Unsecured revolving credit facility \| Maximum
Debt Instrument
Line of credit facility, commitment fee		0.30%
Unsecured revolving credit facility \| LIBOR \| Minimum
Debt Instrument
Basis spread on variable rate		0.83%
Unsecured revolving credit facility \| LIBOR \| Maximum
Debt Instrument
Basis spread on variable rate		1.55%
Unsecured revolving credit facility \| Line of Credit
Debt Instrument
Line of credit facility, borrowing capacity				$ 1,000,000,000.0