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Stockholders' equity and dividend payment, Stock repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock Repurchases [Abstract] |  |  |
Share repurchases (in shares) | 5,513,254 | 0 | 725,298
Aggregate consideration | $ 32,178 |  | $ 3,248
Average price (in dollars per share) | $ 5.82 |  | $ 4.47

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References No definition available. + Details
Name: | dht_PurchaseOfTreasuryStock
Namespace Prefix: | dht_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Average price per share of shares repurchased in open market. + References No definition available. + Details
Name: | dht_TreasuryStockPricePerShare
Namespace Prefix: | dht_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PurchaseOfTreasuryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration