Long-Term Debt - Additional Information1 (Detail) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 744,634,000	$ 735,701,000
Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Number of debt instruments	3
Long-term debt	580,593,000	555,472,000
Reference rate for the variable rate of the debt instrument	LIBOR
Minimum hull coverage ratio	105.00%
Actual hull coverage ratio	114.30%
Debt Instrument, collateral description	The Revolvers are collateralized by 21 of the Company's vessels, together with other
Maintain the greater of free cash liquidity	100,000,000
Minimum liquidity as a percentage of debt	7.50%
Revolving Credit Facilities [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of margin	0.45%	0.45%
Revolving Credit Facilities [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of margin	0.60%	0.60%
Secured Debt [Member]
Debt Instrument [Line Items]
Number of debt instruments	3
Long-term debt	164,041,000	180,229,000
Reference rate for the variable rate of the debt instrument	LIBOR
Minimum hull coverage ratio	120.00%	115.00%
Debt Instrument, collateral description	The term loans are collateralized by first-priority mortgages on six of the Company’s vessels, together with certain other related security.
Maintain the greater of free cash liquidity	100,000,000
Minimum liquidity as a percentage of debt	7.50%
Interest at a weighted-average fixed rate	1.10%	1.20%
Secured Debt [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Term loan fixed interest rate	4.06%
Percentage of margin	0.30%	0.30%
Actual hull coverage ratio	146.70%
Secured Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Term loan fixed interest rate	4.90%
Percentage of margin	1.00%	1.00%
Actual hull coverage ratio	388.90%
Secured Debt [Member] \| Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Aggregate annual long-term principal repayments, 2014	25,200,000
Aggregate annual long-term principal repayments, 2015	83,600,000
Aggregate annual long-term principal repayments, 2016	108,100,000
Aggregate annual long-term principal repayments, 2017	415,300,000
Aggregate annual long-term principal repayments, 2018	53,100,000
Aggregate annual long-term principal repayments, thereafter	$ 59,300,000

The actual hull coverage ratio of the Company as at period end.

No definition available.

Name:	tnk_ActualHullCoverageRatio
Namespace Prefix:	tnk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum hull coverage ratio as required by certain covenants for debts held by the Company.

+ References

No definition available.

+ Details

Name:	tnk_DebtCovenantMinimumHullCoverageRatio
Namespace Prefix:	tnk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt covenants from certain debts held by the Company that is guaranteed by the Company's parent, which requires the Company's parent to maintain a minimum amount of cash and cash equivalents.

+ References

No definition available.

+ Details

Name:	tnk_DebtCovenantParentGuaranteeMinimumLiquidity
Namespace Prefix:	tnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt covenants from certain debts held by the Company that is guaranteed by the Company's parent, which requires the Company's parent to maintain a minimum amount of free cash and undrawn committed revolving credit lines, as a percentage of the parent's total consolidated debt.

+ References

No definition available.

+ Details

Name:	tnk_DebtCovenantParentGuaranteeMinimumLiquidityAsPercentageOfDebt
Namespace Prefix:	tnk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long Term Debt Maturities Repayments Of Principal Thereafter

+ References

No definition available.

+ Details

Name:	tnk_LongTermDebtMaturitiesRepaymentsOfPrincipalThereafter
Namespace Prefix:	tnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number Of Debt Instruments

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Discussion of whether the debt instrument is secured or unsecured, and, if secured, a description of the collateral and guarantees required or provided.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Details

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

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

+ References

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

+ References

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

+ References

+ Details

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

- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

+ Details

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

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant