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Pensions - Assumptions (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	2.40%	2.60%	2.70%
Yield on pension assets	2.40%	2.60%	2.70%
Wage growth	2.50%	2.50%	2.50%
G regulation	2.25%	2.25%	2.25%
Pension adjustment	0.50%	0.00%	0.00%
Average remaining service period	18	19	18

X

- Definition

The average remaining service period of the pension plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	dht_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The assumptions for the defined benefit plan.

+ References

No definition available.

+ Details

Name:	dht_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract
Namespace Prefix:	dht_
Data Type:	xbrli:stringItemType
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X

- Definition

Pension adjustment.

+ References

No definition available.

+ Details

Name:	dht_PensionAdjustment
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Increase of social security base amount ("G") as per Norwegian regulation.

+ References

No definition available.

+ Details

Name:	dht_Regulation
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The yield on the pension assets.

+ References

No definition available.

+ Details

Name:	dht_YieldOnPensionAssets
Namespace Prefix:	dht_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	instant

X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard
-URIDate 2017-03-09

+ Details

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