Long-Term Debt - Additional Information - Other (Detail)	12 Months Ended
Dec. 31, 2017 USD ($) SecurityLoan	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Interest at a weighted-average fixed rate	4.30%	4.00%
Long term debt principal repayments in 2018	$ 800,000,000
Long term debt principal repayments in 2019	200,000,000
Long term debt principal repayments in 2020	1,100,000,000
Long term debt principal repayments in 2021	700,000,000
Long term debt principal repayments in 2022	300,000,000
Long term debt principal repayments thereafter	$ 300,000,000
Number of loan agreement \| SecurityLoan	5
Minimum level of free cash be maintained as per loan agreements	$ 100,000,000	$ 50,000,000
Minimum
Debt Instrument [Line Items]
Vessel market value to loan ratio	118.50%
Vessel market value to loan minimum required ratio	105.00%
Revolving credit lines maturity period	6 months
Free liquidity and undrawn revolving credit line as percentage of debt	5.00%
Maximum
Debt Instrument [Line Items]
Vessel market value to loan ratio	243.20%
Vessel market value to loan minimum required ratio	135.00%
Free liquidity and undrawn revolving credit line as percentage of debt	7.50%
Teekay Parent
Debt Instrument [Line Items]
Amount of free liquidity and undrawn revolving credit line	$ 46,000,000
Teekay Tankers
Debt Instrument [Line Items]
Amount of free liquidity and undrawn revolving credit line	55,100,000
Teekay Tankers \| Long-term Debt
Debt Instrument [Line Items]
Debt guaranteed	252,700,000
Teekay Tankers \| Teekay Parent \| Long-term Debt
Debt Instrument [Line Items]
Debt guaranteed	$ 252,700,000	$ 150,000,000

Amount of free liquidity and undrawn revolving credit line.

No definition available.

Name:	tk_AmountOfFreeLiquidityAndUndrawnRevolvingCreditLine
Namespace Prefix:	tk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount guaranteed by the Company.

+ References

No definition available.

+ Details

Name:	tk_DebtGuaranteed
Namespace Prefix:	tk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Free liquidity and undrawn revolving credit line as percentage of debt.

+ References

No definition available.

+ Details

Name:	tk_FreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum level of free cash maintained per loan agreements.

+ References

No definition available.

+ Details

Name:	tk_MinimumLevelOfFreeCashMaintainedPerLoanAgreements
Namespace Prefix:	tk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number Of Loan Agreements

+ References

No definition available.

+ Details

Name:	tk_NumberOfLoanAgreements
Namespace Prefix:	tk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Undrawn Revolving Credit Facilities Time To Maturity

+ References

No definition available.

+ Details

Name:	tk_UndrawnRevolvingCreditFacilitiesTimeToMaturity
Namespace Prefix:	tk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Vessel Market Value To Loan Ratio

+ References

No definition available.

+ Details

Name:	tk_VesselMarketValueToLoanRatio
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Vessel Market Value to Loan Required Ratio

+ References

No definition available.

+ Details

Name:	tk_VesselMarketValueToLoanRequiredRatio
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: 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 payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=tk_TeekayTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: