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Charter arrangements (Details Text) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Deferred Shipping Revenues [Abstract] |  |  |
Next month charter hire payment paid in advance | $ 0 | $ 2,154 | $ 3,575

X
- Definition Paid in advance + References No definition available. + Details
Name: | dht_DeferredShippingRevenuesAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Paid in Advance + References No definition available. + Details
Name: | dht_NextMonthCharterHirePaymentPaidInAdvance
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant