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General and administrative expenses - Shares held by executives and directors (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares Held By Executives And Directors [Abstract] |  |  |  |
Executives and Directors as a group | [1] | 3,155,503 | 2,729,680 | 2,416,385
[1] | Includes 465,000 (2017: 906,666, 2016: 1,184,155) shares of restricted stock subject to vesting conditions.

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- Definition The disclosure of the shares held by executives and directors. + References No definition available. + Details
Name: | dht_SharesHeldByExecutivesAndDirectorsAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares held by executives and directors as a group. + References No definition available. + Details
Name: | dht_SharesHeldByExecutivesAndDirectorsAsGroup
Namespace Prefix: | dht_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration