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Financial risk management, objectives and policies, ABN AMRO Revolving Credit Facility (Details) - ABN AMRO Revolving Credit Facility [Member] - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2019 | Dec. 31, 2020 | Apr. 30, 2018 | Nov. 30, 2016
Credit Facility [Abstract] |  |  |  |  |
Term |  |  | 5 years |  |
Maximum borrowing capacity |  |  |  | $ 57.3 | $ 50.0
Frequency of periodic repayment |  |  | Quarterly |  |
Reduction amount in credit facility | $ 1.8 | $ 1.3 |  |  |

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- Definition Represents the maximum amount that can be borrowed under a credit facility. + References No definition available. + Details
Name: | dht_CreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the period between issuance and maturity of credit facility, period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | dht_CreditFacilityTerm
Namespace Prefix: | dht_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The description of the frequency of periodic repayment of credit facility. + References No definition available. + Details
Name: | dht_FrequencyOfPeriodicRepayment
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of reduction in outstanding funds that the entity is obligated to repay on quarterly basis. + References No definition available. + Details
Name: | dht_QuarterlyReductionAmountInBorrowings
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_BorrowingsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=dht_ABNAMRORevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |