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Charter arrangements - Shipping revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shipping Revenues [Abstract] |  |  |
Time charter revenues | $ 100,310 | $ 118,997 | $ 122,882
Voyage charter revenues | 254,742 | 234,646 | 241,679
Other shipping revenues |  | 2,366 | 553
Shipping revenues | $ 355,052 | $ 356,010 | $ 365,114

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- Definition Other shipping revenues + References No definition available. + Details
Name: | dht_OtherShippingRevenues
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Shipping Revenues + References No definition available. + Details
Name: | dht_ShippingRevenuesAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of time charter revenues + References No definition available. + Details
Name: | dht_TimeCharterRevenues
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total shipping revenues + References No definition available. + Details
Name: | dht_TotalShippingRevenues
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Voyage charter revenues + References No definition available. + Details
Name: | dht_VoyageCharterRevenues
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration