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Real Estate and Other Investments - Additional Information (Details)	9 Months Ended
	Sep. 30, 2024 property jointVenture state
Real Estate
Number of properties owned (property)	368
Number of states in which properties are located | state	36
Number of states | state	5
Joint Venture
Real Estate
Number of unconsolidated joint ventures | jointVenture	2
SHOP
Real Estate
Number of properties closed	3
Held for sale
Real Estate
Number of properties owned (property)	25

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- Definition

Number Of Real Estate Properties Closed

+ References

No definition available.

+ Details

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- Definition

Number Of States

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+ Details

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- Definition

Number Of Unconsolidated Joint Ventures

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
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Balance Type:	na
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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

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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 976
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477332/976-310-50-1

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- Details

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- Details

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- Details

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