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

No definition available.

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

- Definition

The minimum liquidity required by covenants of certain debt currently held by the company. Liquidity is defined as cash, cash equivalents and undrawn committed revolving credit lines with at least six months to maturity.

+ References

No definition available.

+ Details

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

- Definition

The minimum free liquidity and undrawn revolving credit line required by covenants of certain debt currently held by the Company, as a percentage of total debt.

+ References

No definition available.

+ Details

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

- Definition

Debt Covenant Minimum Hull Coverage Ratio, Thereafter

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioThereafter
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant Minimum Hull Coverage Ratio, Year 1

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioYear1
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioYear12
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant Minimum Hull Coverage Ratio, Year 2

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioYear2
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant Minimum Hull Coverage Ratio, Years 1, 2 and 3

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioYears12and3
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Covenant Minimum Hull Coverage Ratio, Years 3 and 4

+ References

No definition available.

+ Details

Name:	tk_DebtCovenantMinimumHullCoverageRatioYears3and4
Namespace Prefix:	tk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Finance Leased Assets, Number of Units

+ References

No definition available.

+ Details

Name:	tk_FinanceLeasedAssetsNumberofUnits
Namespace Prefix:	tk_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Sale Leaseback Transactions

+ References

No definition available.

+ Details

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

- Definition

Number Of Vessels

+ References

No definition available.

+ Details

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

- Definition

Number Of Vessels Obligated to Purchase

+ References

No definition available.

+ Details

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

- Definition

Number of Vessels with Purchase Option

+ References

No definition available.

+ Details

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

- Definition

[Line Items] for Obligations relating to Finance Leases [Table]

+ References

No definition available.

+ Details

Name:	tk_ObligationsrelatingtoFinanceLeasesLineItems
Namespace Prefix:	tk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period Required to Maintain 90% Hull Coverage Ratio

+ References

No definition available.

+ Details

Name:	tk_PeriodRequiredtoMaintain90HullCoverageRatio
Namespace Prefix:	tk_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.

+ References

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

+ Details

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

- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

+ References

+ Details

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

- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

+ Details

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

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

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

- Definition

Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757

+ Details

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

- Definition

The financing cost related to leases that have been recorded under the deposit method, as a financing or as a capital leases in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

No definition available.

+ Details

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

- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77913982&loc=d3e50796-112755

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888430&loc=SL77919786-209982

+ Details

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

- Details

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

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tk_November2018SaleleasebackTransactionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tk_September2018SaleLeasebackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tk_OptiontoPurchaseJuly2020andNovember2021toEndofTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tk_July2017SaleLeasebackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tk_SuezmaxAframaxandLR2VesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=tk_LNGCarriersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_MajorPropertyClassAxis=tk_SuezmaxAframaxandLR2VesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=tk_SuezmaxTankersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tk_May2019SaleLeasebackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=tk_SalestypeleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	tk_LeaseObligationTypeAxis=tk_FinanceLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases Obligations relating to Finance Leases (Details) $ in Thousands	9 Months Ended		36 Months Ended
	Sep. 30, 2020 USD ($) vessel lease	Sep. 30, 2019 USD ($)	Jan. 31, 2019	Dec. 31, 2019 USD ($) lease
Obligations relating to Finance Leases [Line Items]
Finance Lease, Liability	$ 1,754,557			$ 1,825,692
Payments to Acquire Property, Plant, and Equipment	18,468	$ 98,713
Proceeds from financing related to sale-leaseback of vessels	0	$ 381,526
Current obligations related to finance leases (note 6)	(98,236)			(95,339)
Finance Lease, Liability, Noncurrent	$ 1,656,321			$ 1,730,353
Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Finance Lease, Weighted Average Discount Rate, Percent	7.60%			7.60%
Number Of Vessels Obligated to Purchase \| vessel	8
Number Of Sale Leaseback Transactions \| vessel	16
November 2018 Sale-leaseback Transaction [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Finance Leased Assets, Number of Units \| vessel	4
Debt Covenant Minimum Hull Coverage Ratio Year 1 & 2	100.00%
September 2018 Sale-leaseback Transaction [Member] [Domain] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Number Of Vessels \| vessel	6
Debt Covenant Minimum Hull Coverage Ratio, Year 1	75.00%
Debt Covenant Minimum Hull Coverage Ratio, Year 2	78.00%
Debt Covenant Minimum Hull Coverage Ratio, Years 3 and 4	80.00%
Debt Covenant Minimum Hull Coverage Ratio, Thereafter	90.00%
Suezmax Tanker Sale Leaseback [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Number of Vessels with Purchase Option \| vessel	16
July 2017 Sale Leaseback [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Number Of Vessels \| vessel	4
Debt Covenant Minimum Hull Coverage Ratio, Years 1, 2 and 3	90.00%
Period Required to Maintain 90% Hull Coverage Ratio	three years
Debt Covenant Minimum Hull Coverage Ratio, Thereafter	100.00%
Minimum [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Sale Leaseback Transaction, Lease Terms	9
Minimum [Member] \| November 2018 Sale-leaseback Transaction [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	113.00%			140.00%
Minimum [Member] \| September 2018 Sale-leaseback Transaction [Member] [Domain] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	87.00%			106.00%
Minimum [Member] \| July 2017 Sale Leaseback [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	119.00%			110.00%
Maximum \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Sale Leaseback Transaction, Lease Terms	12
Maximum \| November 2018 Sale-leaseback Transaction [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	156.00%			173.00%
Maximum \| September 2018 Sale-leaseback Transaction [Member] [Domain] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	104.00%			123.00%
Maximum \| July 2017 Sale Leaseback [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Actual Hull Coverage Ratio	141.00%			132.00%
Suezmax, Aframax and LR2 Vessels [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Finance Lease, Liability, Payment, Due	$ 559,700
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	163,600
LNG Carriers [Member] \| Teekay LNG
Obligations relating to Finance Leases [Line Items]
Sale Leaseback Transaction, Imputed Interest Rate			5.10%
LNG Carriers [Member] \| Minimum [Member] \| Teekay LNG
Obligations relating to Finance Leases [Line Items]
Sale Leaseback Transaction, Lease Terms			7.5
LNG Carriers [Member] \| Maximum \| Teekay LNG
Obligations relating to Finance Leases [Line Items]
Sale Leaseback Transaction, Lease Terms			15
Suezmax, Aframax and LR2 Vessels [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Finance Lease, Liability, Payments, Due Next Twelve Months	14,235
Finance Lease, Liability, Payments, Due Year Two	56,222
Finance Lease, Liability, Payments, Due Year Three	56,213
Finance Lease, Liability, Payments, Due Year Four	56,204
Finance Lease, Liability, Payments, Due Year Five	56,348
Finance Lease, Liability, Payments, Due after Year Five	$ 320,481
Suezmax Tankers [Member] \| May 2019 Sale Leaseback [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Debt Covenant Minimum Hull Coverage Ratio, Year 2	78.00%
Debt Covenant Minimum Hull Coverage Ratio, Years 3 and 4	80.00%
Finance Leased Assets, Number of Units \| vessel	2
Actual Hull Coverage Ratio	91.00%			109.00%
Debt Covenant Minimum Hull Coverage Ratio Year 1 & 2	75.00%
Debt Covenant Minimum Hull Coverage Ratio, Thereafter	90.00%
Sales-type lease [Member] \| LNG Carriers [Member] \| Teekay LNG
Obligations relating to Finance Leases [Line Items]
Number Of Vessels \| lease	9			9
Finance Lease, Liability, Payment, Due	$ 1,800,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	417,700
Finance Lease, Liability, Payments, Due Next Twelve Months	34,831
Finance Lease, Liability, Payments, Due Year Two	138,601
Finance Lease, Liability, Payments, Due Year Three	136,959
Finance Lease, Liability, Payments, Due Year Four	135,459
Finance Lease, Liability, Payments, Due Year Five	132,011
Finance Lease, Liability, Payments, Due after Year Five	1,198,366
LNG Carriers [Member] \| Teekay LNG
Obligations relating to Finance Leases [Line Items]
Finance Lease, Liability	1,358,485			$ 1,410,904
Conventional Tankers [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Finance Lease, Liability	396,072			$ 414,788
Finance Lease Obligations [Member] \| Suezmax, Aframax and LR2 Vessels [Member] \| Teekay Tankers
Obligations relating to Finance Leases [Line Items]
Debt Covenant Minimum Free Liquidity And Undrawn Revolving Credit Line	$ 35,000
Debt Covenant Minimum Free Liquidity And Undrawn Revolving Credit Line As Percentage Of Debt	5.00%