Interest bearing debt, Credit Agricole Credit Facility (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
Jun. 30, 2016	Sep. 30, 2020
Credit Facility [Abstract]
Borrowing amount		$ 492,368
Credit Agricole Credit Facility [Member]
Credit Facility [Abstract]
Debt prepayment before installment term	$ 5,000	$ 12,700
Frequency of periodic repayment		Quarterly
Borrowing amount		$ 48,700
Debt repayment installment amount		700
Debt repayment final amount		$ 29,700
Adjustment to interest rate basis		2.19%
Credit facility covenant, required adjusted tangible net worth		$ 200,000
Credit Agricole Credit Facility [Member] \| Bottom of Range [Member]
Credit Facility [Abstract]
Credit facility covenant, required percentage of charter-free market value of vessels to borrowings		135.00%
Credit facility covenant, required percentage of adjusted tangible net worth to total assets		25.00%
Credit facility covenant, required unencumbered consolidated cash		$ 20,000
Credit facility covenant, required percentage of unencumbered consolidated cash to gross interest bearing debt		6.00%
Credit Agricole Credit Facility [Member] \| LIBOR [Member]
Credit Facility [Abstract]
Adjustment to interest rate basis		2.19%

The amount of adjusted tangible net worth required to be maintained to fulfill Credit facility covenant.

No definition available.

Name:	dht_CreditFacilityCovenantRequiredAdjustedTangibleNetWorth
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of adjusted tangible net worth to adjusted total assets value required to be maintained to fulfill Credit facility covenant.

+ References

No definition available.

+ Details

Name:	dht_CreditFacilityCovenantRequiredPercentageOfAdjustedTangibleNetWorthToTotalAssets
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of unencumbered consolidated cash to gross interest bearing debt required to be maintained to fulfill credit facility covenant.

+ References

No definition available.

+ Details

Name:	dht_CreditFacilityCovenantRequiredPercentageOfUnencumberedConsolidatedCashToGrossInterestBearingDebt
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of unencumbered consolidated cash required to be maintained to fulfill Credit facility covenant.

+ References

No definition available.

+ Details

Name:	dht_CreditFacilityCovenantRequiredUnencumberedConsolidatedCash
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Refers to the required percentage of the charter-free market value of the vessels to the borrowings under the covenants of the credit facility.

+ References

No definition available.

+ Details

Name:	dht_CreditFacilityCovenantsPercentageOfCharterFreeMarketValueOfVesselsToBorrowings
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic installment payments including both interest and principal payments.

+ References

No definition available.

+ Details

Name:	dht_DebtInstrumentPeriodicInstallmentPayment
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of prepayment of debt for final settlement.

+ References

No definition available.

+ Details

Name:	dht_DebtRepaymentFinalAmount
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The description of the frequency of periodic repayment of credit facility.

+ References

No definition available.

+ Details

Name:	dht_FrequencyOfPeriodicRepayment
Namespace Prefix:	dht_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of voluntary prepayment of debt before installment term.

+ References

No definition available.

+ Details

Name:	dht_VoluntaryPrepaymentOfDebtBeforeInstallmentTerm
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	ifrs-full_BorrowingsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=dht_CreditAgricoleCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=dht_LondonInterbankOfferedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: