v3.8.0.1

Derivative Instruments - Summary of Interest Rate Swap Positions (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2014 | Dec. 31, 2016
Minimum [Member] |  |
Derivative [Line Items] |  |
Margin on variable-rate debt |  | 0.30%
Maximum [Member] |  |
Derivative [Line Items] |  |
Margin on variable-rate debt |  | 2.00%
U.S. Dollar-denominated interest rate swaps one [Member] |  |
Derivative [Line Items] |  |
Principal Amount |  | $ 200,000,000
Fair Value / Carrying Amount of Asset (Liability) |  | $ 397,000
Remaining Term (years) |  | 4 years
Fixed Interest Rate |  | 1.46%
U.S. Dollar-denominated interest rate swaps two [Member] |  |
Derivative [Line Items] |  |
Principal Amount |  | $ 150,000,000
Fair Value / Carrying Amount of Asset (Liability) |  | $ 1,479,000
Remaining Term (years) |  | 4 years
Fixed Interest Rate |  | 1.55%
U.S. Dollar-denominated interest rate swaps three [Member] |  |
Derivative [Line Items] |  |
Principal Amount |  | $ 50,000,000
Fair Value / Carrying Amount of Asset (Liability) |  | $ 1,267,000
Remaining Term (years) |  | 4 years
Fixed Interest Rate |  | 1.16%
TTOL [Member] | Time-charter Swap [Member] |  |
Derivative [Line Items] |  |
Sale price of contract | $ 2,100,000 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Sale price of derivative contract + References No definition available. + Details
Name: | tnk_Salepriceofcontract
Namespace Prefix: | tnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeRemainingMaturity1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tnk_UnitedStatesDollarDenominatedInterestRateSwapsOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tnk_UnitedStatesDollarDenominatedInterestRateSwapsTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tnk_UnitedStatesDollarDenominatedInterestRateSwapsThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=tnk_TTOLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=tnk_TimecharterSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |