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VESSELS (Details) $ in Thousands	Jun. 30, 2020 USD ($) Vessel	Dec. 31, 2019 USD ($) Vessel
VESSELS [Abstract]
Number of vessels | Vessel	23	23
Vessels and Drydocking | $	$ 1,375,407	$ 1,369,567
Less Accumulated Depreciation | $	(502,900)	(469,570)
Vessels, net | $	$ 872,507	$ 899,997
Number of vessels the Company has taken through periodical maintenance survey | Vessel	1
Number of vessels in drydock for periodical maintenance | Vessel	4

X

- Definition

The number of vessels in drydock for periodical maintenance survey as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

The number of vessels the company has taken through periodical maintenance survey as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nat_NumberOfVesselsTakenThroughPeriodicalMaintenanceSurvey
Namespace Prefix:	nat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount before accumulated depreciation of vessels used in the normal conduct of business and not intended for resale.

+ References

No definition available.

+ Details

Name:	nat_VesselsGross
Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount at the balance sheet date of vessels used in the normal conduct of business and not intended for resale, net of accumulated depreciation on vessels.

+ References

No definition available.

+ Details

Name:	nat_VesselsNet
Namespace Prefix:	nat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The number of vessels under the operational management at of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nat_VesselsUnderOperations
Namespace Prefix:	nat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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