v2.4.0.8

Investment in Term Loans - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Jul. 31, 2010 Vessel	Dec. 31, 2013 Vessel	Dec. 31, 2012 Vessel	Dec. 31, 2011	Mar. 31, 2014 Subsequent Events [Member] Vessel	Dec. 31, 2013 Accrued Income Receivable [Member]
Net Investment Income [Line Items]
Total amount of the term loan including costs of acquisition	$ 115,600,000	$ 9,120,000	$ 0	$ 0
Interest rate on term loan	9.00%
Investment yield	10.00%
Investment, Interest Rate Reflects Current Yield Flag	true
Repayment premium included in principal balance		3,400,000	2,700,000
Accrued but unpaid interest		8,600,000	1,600,000
Investment in term loans						$ 5,900,000
Number of 2010-built VLCC collateralized for loans	2	2	2
Number of vessels					2,000,000

X

- Definition

The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 12

-Sentence Column A

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Indicates the interest rate in the "Investment, Interest Rate" concept is the current yield of the investment as of the date of the report.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 12

-Sentence Column A

+ Details

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Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fixed interest rate on investment on term loans.

+ References

No definition available.

+ Details

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

X

- Definition

Number Of Vessels

+ References

No definition available.

+ Details

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

X

- Definition

Number Of Vessels Held As Collateral

+ References

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Repayment Premium Included In Principal Balance

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ 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 210.5-02.8)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5

+ Details

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

X

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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Data Type:	xbrli:monetaryItemType
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- Definition

The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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