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General & Administrative Expenses - Shares held by executives and directors (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares Held By Executives And Directors [Abstract]
Executives and Directors as a group	2,729,680	2,416,385	1,967,768

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- Definition

The disclosure of the shares held by executives and directors.

+ References

No definition available.

+ Details

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- Definition

The number of shares held by executives and directors as a group.

+ References

No definition available.

+ Details

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