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Financial Instruments - Interest Bearing Debt (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Interest bearing debt
Remaining notional	$ 801,150
Carrying amount	$ 786,204	$ 701,495
Nordea Samco Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.5%
Remaining notional	$ 220,207
Carrying amount	$ 217,921	256,166
Credit Agricole Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.19%
Remaining notional	$ 69,315
Carrying amount	$ 68,591	75,601
Danish Ship Finance Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.25%
Remaining notional	$ 44,200
Carrying amount	$ 43,937	46,432
Nordea/DNB Credit Facility One [Member]
Interest bearing debt
Interest rate	LIBOR+2.25%
Remaining notional	$ 45,000
Carrying amount	$ 44,647	47,012
Nordea/DNB Credit Facility Two [Member]
Interest bearing debt
Interest rate	LIBOR+2.75%
Remaining notional	$ 9,988
Carrying amount	$ 9,884	37,579
ABN Amro Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.6%
Remaining notional	$ 121,268
Carrying amount	$ 119,844	128,790
Nordea BW VLCC Acquisition Credit Facility [Member]
Interest bearing debt
Interest rate	LIBOR+2.40
Remaining notional	$ 185,346
Carrying amount	183,119
Convertible Senior Notes [Member]
Interest bearing debt
Remaining notional	105,826
Carrying amount	$ 98,262	$ 109,916
Interest rate	4.50%

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

No definition available.

+ Details

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Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	dht_CreditFacilityAxis=dht_CreditAgricoleCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Data Type:	na
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X

- Details

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- Details

Name:	dht_CreditFacilityAxis=dht_ABNAmroCreditFacilityMember
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type: