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Vessels and subsidiaries, Vessels and time charter contracts (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Vessel
Dec. 31, 2019
USD ($)
Reconciliation of changes in property, plant and equipment [abstract]          
Net book value $ 1,476,436,000     $ 1,476,436,000 $ 1,589,444,000
Depreciation and amortisation expense [abstract]          
Estimated scrap rate used as a basis for depreciation per ton       300  
Impairment [Abstract]          
Non-cash impairment charge $ 7,600,000 $ 4,900,000   $ 12,600,000  
Number of vessels recorded non-cash impairment charge | Vessel       3  
Percentage of estimated weighted average cost of capital 8.59% 8.12%      
Percentage of decreasing the weighted average cost of capital 0.50%        
Impact of a 0.5% adverse change of weighted average cost of capital on impairment charge $ 1,500,000        
Increasing/(decreasing) in future charter rates per day 500        
Impact of $500 per day adverse change of future charter rates on impairment charge 1,400,000        
Impact of $500 per day favorable change of future charter rates on impairment charge (1,400,000)        
Cost [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       $ 2,106,997,000 2,071,456,000
Additions [1]         (1,139,000)
Transferred from vessels upgrades       22,964,000 39,795,000
Disposals       (8,505,000) (3,116,000)
Balance, end of period 2,121,456,000     2,121,456,000 2,106,997,000
Accumulated Depreciation and Impairment [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       (517,553,000) (405,647,000)
Charge for the period       (123,412,000) (115,022,000)
Impairment charges       (12,560,000)  
Disposals       8,505,000 3,116,000
Balance, end of period (645,020,000)     (645,020,000) (517,553,000)
Vessel Upgrades [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       11,652,000 0
Additions       28,581,000 51,446,000
Transferred to vessels       (22,964,000) (39,795,000)
Balance, end of period 17,269,000     17,269,000 11,652,000
Time Charter Contracts [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Net book value 452,000     452,000 1,430,000
Time Charter Contracts [Member] | Cost [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       6,600,000 6,600,000
Additions [1]         0
Transferred from vessels upgrades       0 0
Disposals       0 0
Balance, end of period 6,600,000     6,600,000 6,600,000
Time Charter Contracts [Member] | Accumulated Depreciation and Impairment [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       (5,170,000) (4,193,000)
Charge for the period       (978,000) (978,000)
Impairment charges       0  
Disposals         0
Balance, end of period (6,148,000)     (6,148,000) (5,170,000)
Time Charter Contracts [Member] | Vessel Upgrades [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       0 0
Additions       0 0
Transferred to vessels       0 0
Balance, end of period 0     0 0
VLCC [Member]          
Impairment [Abstract]          
Impairment rate for time charter equivalents, remaining period in current year   $ 20,107      
Impairment rate for time charter equivalents, first year   21,550   19,610  
Impairment rate for time charter equivalents, second year   21,194   25,279  
Impairment rate for time charter equivalents, thereafter   $ 42,557   $ 42,466  
Percentage of reduction in impairment rate   20.00%   20.00%  
Consideration period for reduction in impairment rate       15 years  
VLCC [Member] | VLCCs built 2015 and Later [Member]          
Impairment [Abstract]          
Lower fuel consumption for modern vessels   $ 4,000   $ 4,000  
Vessels [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Net book value 1,422,279,000     $ 1,422,279,000 1,526,097,000
Depreciation and amortisation expense [abstract]          
Estimated useful life of assets       20 years  
Vessels [Member] | Cost [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       $ 2,014,093,000 2,007,385,000
Additions [1]         (42,000)
Transferred from vessels upgrades       4,896,000 6,750,000
Disposals       0 0
Balance, end of period 2,018,989,000     2,018,989,000 2,014,093,000
Vessels [Member] | Accumulated Depreciation and Impairment [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       (487,996,000) (391,894,000)
Charge for the period       (96,153,000) (96,102,000)
Impairment charges       (12,560,000)  
Disposals         0
Balance, end of period (596,709,000)     (596,709,000) (487,996,000)
Vessels [Member] | Vessel Upgrades [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       1,371,000 0
Additions       6,313,000 8,121,000
Transferred to vessels       (4,896,000) (6,750,000)
Balance, end of period 2,788,000     2,788,000 1,371,000
Drydock [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Net book value 22,665,000     22,665,000 25,941,000
Drydock [Member] | Cost [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       43,820,000 44,818,000
Additions [1]         (375,000)
Transferred from vessels upgrades       9,480,000 2,493,000
Disposals       (8,505,000) (3,116,000)
Balance, end of period 44,795,000     44,795,000 43,820,000
Drydock [Member] | Accumulated Depreciation and Impairment [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       (17,880,000) (9,171,000)
Charge for the period       (12,756,000) (11,824,000)
Impairment charges       0  
Disposals       8,505,000 3,116,000
Balance, end of period (22,130,000)     (22,130,000) (17,880,000)
Drydock [Member] | Vessel Upgrades [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       0 0
Additions       12,745,000 2,493,000
Transferred to vessels       (9,480,000) (2,493,000)
Balance, end of period 3,265,000     3,265,000 0
Scrubbers [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Net book value 31,039,000     31,039,000 $ 35,976,000
Depreciation and amortisation expense [abstract]          
Estimated useful life of assets         3 years
Impairment [Abstract]          
Lower fuel consumption for modern vessels   $ 3,000   4,000  
Scrubbers [Member] | Cost [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       42,482,000 $ 12,652,000
Additions [1]         (721,000)
Transferred from vessels upgrades       8,589,000 30,552,000
Disposals       0 0
Balance, end of period 51,071,000     51,071,000 42,482,000
Scrubbers [Member] | Accumulated Depreciation and Impairment [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       (6,507,000) (388,000)
Charge for the period       (13,525,000) (6,118,000)
Impairment charges       0  
Disposals         0
Balance, end of period (20,032,000)     (20,032,000) (6,507,000)
Scrubbers [Member] | Vessel Upgrades [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Balance, beginning of period       10,281,000 0
Additions       9,524,000 40,832,000
Transferred to vessels       (8,589,000) (30,552,000)
Balance, end of period 11,216,000     11,216,000 $ 10,281,000
DHT Cathy and DHT Sophie [Member]          
Reconciliation of changes in property, plant and equipment [abstract]          
Impairment charges     $ 3,500,000    
DHT China [Member]          
Impairment [Abstract]          
Non-cash impairment charge       2,800,000  
Recoverable amount 38,400,000     38,400,000  
DHT Europe [Member]          
Impairment [Abstract]          
Non-cash impairment charge       6,300,000  
Recoverable amount 38,000,000     38,000,000  
DHT Scandinavia [Member]          
Impairment [Abstract]          
Non-cash impairment charge       3,500,000  
Recoverable amount $ 40,400,000     $ 40,400,000  
[1] Additions in 2019 relates to adjustments to capitalized expenses in 2018.