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Business and Property Management Agreements with RMR (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) employee	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) employee agreement jointVenture_arrangement property	Jun. 30, 2022 USD ($)
Related person transactions
Number of employees | employee	0		0
Property management and construction supervision fees	$ 2,202	$ 2,518	$ 4,194	$ 4,909
Property management and construction supervision fees paid	3,561	3,111	7,094	6,075
RMR
Related person transactions
Business management fees incurred	3,321	4,506	$ 6,591	9,319
Period of actual amount of incentive fees			3 years
Property management and construction supervision fees	1,400	1,272	$ 2,863	2,621
Party transaction property management and construction supervision fees capitalized	$ 802	$ 1,246	$ 1,331	$ 2,288
Number joint venture arrangements | jointVenture_arrangement			2
Number of medical office and life science properties | property			10
Senior Living Communities | RMR
Related person transactions
Number of consecutive renewal terms of agreement | agreement			2

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- Definition

Number of persons employed by the Entity

+ References

No definition available.

+ Details

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- Definition

Represents the business management fees incurred pursuant to business management agreement with related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Number Joint Venture Arrangements

+ References

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- Definition

Number Of Medical Office And Life Science Properties

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- Definition

Period Of Actual Amount Of Incentive Fees

+ References

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- Definition

Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Property Management And Construction Supervision Fees, Capitalized

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represents the property management and construction supervision fees paid to related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the number of consecutive renewal terms of agreement that the entity has the option to renew.

+ References

No definition available.

+ Details

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- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

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- Details

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