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v3.21.1

General information (Details) | 12 Months Ended
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Dec. 31, 2020 Subsidiaries CrudeCarrier t
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 34
Number of large crude carriers | CrudeCarrier | 27
Total carrying capacity | t | 8,360,850
Top of Range [Member] |
Disclosure of subsidiaries [abstract] |
Weight of tankers | t | 320,000
Bottom of Range [Member] |
Disclosure of subsidiaries [abstract] |
Weight of tankers | t | 200,000
Marshall Island [Member] |
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 22
Number of vessel-owning subsidiaries | 22
Cayman Islands [Member] |
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 7
Number of vessel-owning subsidiaries | 7
Singapore [Member] |
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 3
Monegasque [Member] |
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 1
Norwegian [Member] |
Disclosure of subsidiaries [abstract] |
Number of wholly owned subsidiaries | 1

X
- Definition Number of large crude carriers by the entity. + References No definition available. + Details
Name: | dht_NumberOfLargeCrudeCarriers
Namespace Prefix: | dht_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents number of vessel-owning subsidiaries by the entity. + References No definition available. + Details
Name: | dht_NumberOfVesselOwningSubsidiaries
Namespace Prefix: | dht_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents number of wholly owned subsidiaries by the entity. + References No definition available. + Details
Name: | dht_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix: | dht_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total carrying capacity of tankers. + References No definition available. + Details
Name: | dht_TotalCarryingCapacity
Namespace Prefix: | dht_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents weight of tankers in different size ranges. + References No definition available. + Details
Name: | dht_WeightOfTankers
Namespace Prefix: | dht_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=dht_MarshallIslandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=dht_CaymanIslandsOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=country_SG
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=dht_MonegasqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=dht_NorwegianMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |