Number Of Vessels

No definition available.

Name:	tnk_NumberOfVessels
Namespace Prefix:	tnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of Vessels agreed to be sold

+ References

No definition available.

+ Details

Name:	tnk_NumberOfVesselsAgreedToBeSold
Namespace Prefix:	tnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Vessels held for sale

+ References

No definition available.

+ Details

Name:	tnk_NumberOfVesselsHeldForSale
Namespace Prefix:	tnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Vessels Impaired

+ References

No definition available.

+ Details

Name:	tnk_NumberOfVesselsImpaired
Namespace Prefix:	tnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of vessels sold during the period.

+ References

No definition available.

+ Details

Name:	tnk_NumberOfVesselsSold
Namespace Prefix:	tnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Adjustment to the cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period, upon closing.

+ References

No definition available.

+ Details

Name:	tnk_ProceedsFromDivestitureofBusinessAdjustment
Namespace Prefix:	tnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reversal of Asset Impairment Charges

+ References

No definition available.

+ Details

Name:	tnk_ReversalOfAssetImpairmentCharges
Namespace Prefix:	tnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ References

+ Details

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

+ Details

Name:	us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

+ Details

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

+ Details

Name:	us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tnk_SuezmaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tnk_SuezmaxAframaxandLR2VesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tnk_LR2AndAframaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=tnk_SuezmaxAframaxandLR2VesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=tnk_SuezmaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=tnk_LR2AndAframaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnk_SuezmaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnk_AframaxTankerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnk_LR2AndAframaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnk_SuezmaxTankerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tnk_SuezmaxLR2AndAframaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=tnk_ShipToShipTransferBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=tnk_ShipToShipTransferMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Write-down and Loss on Sale of Assets (Details)	12 Months Ended
Write-down and Loss on Sale of Assets (Details)	Dec. 31, 2022 USD ($) vessel	Dec. 31, 2021 USD ($) vessel	Dec. 31, 2020 USD ($) vessel
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets	$ 9,400,000
Proceeds from Sale of Property, Plant, and Equipment	68,400,000	$ 56,700,000
Operating Lease, Impairment Loss	1,100,000	700,000	$ 2,900,000
Gain (loss) on sale and (write-down) of assets (note 19)	$ 8,888,000	(92,368,000)	(69,446,000)
Suezmax Tankers
Property, Plant and Equipment [Line Items]
Number of Vessels agreed to be sold \| vessel	1
Suezmax, Aframax and LR2 Vessels
Property, Plant and Equipment [Line Items]
Asset Impairment Charges		$ 4,600,000
Number of Vessels agreed to be sold \| vessel		2
LR2 and Aframax Tankers
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			1,600,000
Suezmax, Aframax and LR2 Vessels
Property, Plant and Equipment [Line Items]
Asset Impairment Charges		$ 85,000,000
Suezmax Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel		3
LR2 and Aframax Tankers
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			$ 65,400,000
Number Of Vessels Impaired \| vessel		4	9
Suezmax Tankers
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets			$ 2,600,000
Number Of Vessels Sold \| vessel			3
Aframax Tanker
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets		$ 2,100,000
LR2 and Aframax Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels Sold \| vessel	3	4	2
Number Of Vessels	1	2
Reversal of Asset Impairment Charges	$ 600,000
Suezmax Tanker
Property, Plant and Equipment [Line Items]
Number Of Vessels Sold \| vessel	1
Suezmax, LR2 and Aframax Tankers
Property, Plant and Equipment [Line Items]
Number of Vessels held for sale \| vessel		3
Ship to Ship Transfer Business \| Ship To Ship Transfer [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Business			$ 3,100,000
Proceeds from business divestiture			27,100,000
Proceeds From Divestiture of Business Adjustment			$ 1,100,000