Business Acquisition Purchase Price Allocation Square Footage.

No definition available.

Name:	hr_BusinessAcquisitionPurchasePriceAllocationSquareFootage
Namespace Prefix:	hr_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Business Combination, Increase (Decrease) to Purchase Price for Adjustments/Credits

+ References

No definition available.

+ Details

Name:	hr_BusinessCombinationIncreaseDecreasetoPurchasePriceforAdjustmentsCredits
Namespace Prefix:	hr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Real Property

+ References

No definition available.

+ Details

Name:	hr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRealProperty
Namespace Prefix:	hr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Fair Value Adjustments and Other

+ References

No definition available.

+ Details

Name:	hr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedIntangibleAssetsFairValueAdjustmentsandOther
Namespace Prefix:	hr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Notes Assumed, Unamortized Premium

+ References

No definition available.

+ Details

Name:	hr_NotesAssumedUnamortizedPremium
Namespace Prefix:	hr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of Beds

+ References

No definition available.

+ Details

Name:	hr_NumberofBeds
Namespace Prefix:	hr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of property leased.

+ References

No definition available.

+ Details

Name:	hr_PercentageOfPropertyLeased
Namespace Prefix:	hr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(7)(ii))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-10(c)(3)(ii)(A))
-URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862

+ Details

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

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Acquisition Date
-URI http://asc.fasb.org/extlink&oid=6919109

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e848-128460

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredOther1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ 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

+ Details

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

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	hr_RealEstateAcquisitionsAndMortgageNoteFinancingAxis=hr_RealEstateAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_WA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_DC
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_MD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hr_InovaHealthSystemMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hr_MedicalOfficeBuildingOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hr_MedicalOfficeBuildingTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Real Estate Investments - Acquisitions (Details) $ in Millions								9 Months Ended
	Oct. 17, 2016 USD ($) ft² Bed	Oct. 11, 2016 USD ($) ft² Bed	Sep. 26, 2016 USD ($) ft² Bed	Sep. 12, 2016 USD ($) ft² Bed	May 13, 2016 USD ($) ft² Bed	Apr. 29, 2016 USD ($) ft² Bed	Mar. 31, 2016 USD ($) ft² Bed	Sep. 30, 2016 USD ($) ft²
Business Acquisition [Line Items]
Square footage \| ft²								370,606
Real Estate								$ 176.5
Other								(2.2)
Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price								178.2
Cash consideration								161.1
Purchase price adjustments/credits								(3.9)
Capital obligations								(13.2)
WASHINGTON \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²				87,462		46,637	69,712
Purchase price				$ 53.1		$ 21.6	$ 38.3
Cash consideration				53.0		18.8	37.7
Purchase price credits				0.1		1.5
Purchase price adjustments/credits				(0.1)		(2.8)	(0.6)
Acquisition costs expensed							1.6
Capital obligations				$ 0.0		$ 0.0	$ 0.0
Number of Beds \| Bed				321		321	281
Percentage of property leased				100.00%		100.00%	100.00%
Date Acquired				Sep. 12, 2016		Apr. 29, 2016	Mar. 31, 2016
Real Estate				$ 54.6		$ 20.1	$ 37.7
Other				$ (1.6)		$ (1.3)	$ 0.0
Washington, DC [Member] \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²			103,783
Purchase price			$ 45.2
Cash consideration			45.1
Purchase price adjustments/credits			(0.1)
Capital obligations			$ 0.0
Number of Beds \| Bed			183
Percentage of property leased			100.00%
Date Acquired			Sep. 26, 2016
Real Estate			$ 43.7
Other			$ 1.4
CALIFORNIA \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²					63,012
Purchase price					$ 20.0
Cash consideration					6.5
Purchase price adjustments/credits					(0.3)
Capital obligations					$ (13.2)
Number of Beds \| Bed					225
Percentage of property leased					80.00%
Date Acquired					May 13, 2016
Real Estate					$ 20.4
Other					(0.7)
Premium recorded at acquisition					$ 0.8			$ 0.8
Stated interest rate (percent)					4.77%
Subsequent Event [Member] \| WASHINGTON \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²	29,753
Purchase price	$ 9.8
Number of Beds \| Bed	217
Percentage of property leased	96.00%
Subsequent Event [Member] \| MARYLAND \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price		$ 36.3
Cash consideration		36.4
Purchase price adjustments/credits		$ 0.1
Number of Beds \| Bed		181
Percentage of property leased		92.00%
Inova Health System [Member] \| Washington, DC [Member] \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Number of Beds \| Bed			1,700
Medical Office Building One [Member] \| Subsequent Event [Member] \| MARYLAND \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²		82,763
Medical Office Building Two [Member] \| Subsequent Event [Member] \| MARYLAND \| Real Estate Acquisitions [Member]
Business Acquisition [Line Items]
Square footage \| ft²		30,868