Stockholders' equity and dividend payments, Stock repurchases (Details) - shares	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Stock Repurchases [Abstract]
Share repurchases (in shares)	0	0

Number of shares that have been repurchased during the period and are being held in treasury.

No definition available.

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