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Financial risk management, objectives and policies - Maximum exposure to credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Maximum Exposure To Credit Risk [Abstract] |  |
Cash and cash equivalents | $ 77,292 | $ 109,295
Accounts receivable and accrued revenues | 42,212 | 34,461
Maximum credit exposure | $ 119,504 | $ 143,756

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- Definition The amount of accounts receivable and accrued revenues for financial risk management. + References No definition available. + Details
Name: | dht_AccountsReceivableAndAccruedRevenuesForFinancialRiskManagement
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of cash and cash equivalents to manage financial risk. + References No definition available. + Details
Name: | dht_CashAndCashEquivalentsForFinancialRiskManagement
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum credit exposure. + References No definition available. + Details
Name: | dht_MaximumCreditExposure
Namespace Prefix: | dht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum exposure to credit risk + References No definition available. + Details
Name: | dht_MaximumExposureToCreditRiskAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration