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Charter arrangements - Summary of vessel employment (Details) | 12 Months Ended
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Dec. 31, 2017
DHT Amazon | VLCC |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q4 2018
DHT Bauhinia | VLCC |
Vessel employment |
Type of Employment | Spot
DHT China | VLCC |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q2 2021
DHT Condor | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Edelweiss | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Europe | VLCC |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q1 2019
DHT Falcon | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Hawk | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Jaguar | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Lake | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Leopard | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Lion | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Lotus | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Opal | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Panther | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Peony | VLCC |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q4 2018
DHT Puma | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Raven | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Redwood | VLCC |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q1 2018
DHT Scandinavia | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Sundarbans | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Taiga | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Tiger | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Utik | VLCC |
Vessel employment |
Type of Employment | Spot
DHT Cathy | Aframax |
Vessel employment |
Type of Employment | Time Charter
Expiry | Q2 2018
DHT Sophie | Aframax |
Vessel employment |
Type of Employment | Spot

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- Definition Lease Expiration Month Year + References No definition available. + Details
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Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Type of Employment + References No definition available. + Details
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Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Vessel Employment Abstract + References No definition available. + Details
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Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_VesselTypeAxis=dht_VLCCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtBauhiniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtChinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtCondorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtEdelweissMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtFalconMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DHTHawkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtJaguarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtLakeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtLeopardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtLionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtLotusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtOpalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtPantherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtPeonyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtPumaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtRavenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtRedwoodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtScandinaviaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtSundarbansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtTaigaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtTigerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtUtikMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtCathyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_VesselTypeAxis=dht_AframaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dht_PropertySubjectToOrAvailableForOperatingLeaseAxis=dht_DhtSophieMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |