Debt Collateral, Equity Interest in Subsidiaries, Number of Common Shares/Units

No definition available.

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

- Definition

Debt Instrument, Collateral, Number of Vessels

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Reduction Of Available Borrowing Capacity In Year Three

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Reduction Of Available Borrowing Capacity In Year Two

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Reduction Of Available Borrowing Capacity Remainder Of Fiscal Year

+ References

No definition available.

+ Details

Name:	tk_LineOfCreditReductionOfAvailableBorrowingCapacityRemainderOfFiscalYear
Namespace Prefix:	tk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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 Credit Facilities

+ References

No definition available.

+ Details

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

- Definition

Number of debt instruments.

+ References

No definition available.

+ Details

Name:	tk_NumberOfDebtInstruments
Namespace Prefix:	tk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of debt instruments with balloon or bullet payments.

+ References

No definition available.

+ Details

Name:	tk_NumberOfDebtInstrumentsWithBalloonOrBulletPayments
Namespace Prefix:	tk_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

Number Of Vessels Held As Collateral

+ References

No definition available.

+ Details

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

- Definition

Number of Subsidiaries

+ References

No definition available.

+ Details

Name:	tk_NumberofSubsidiaries
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:	dtr-types: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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

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

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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+ Details

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

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

+ Details

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

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

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+ Details

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

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal or face amount used to calculate payment on derivative.

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Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in remainder of current fiscal year.

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Namespace Prefix:	us-gaap_
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Long-Term Debt - Summary of Long-Term Debt (Detail) $ / shares in Units, € in Millions, shares in Millions, kr in Millions		6 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Jun. 30, 2021 USD ($) term_loan vessel subsidiary shares SecurityLoan	Dec. 31, 2020 USD ($) vessel	Jun. 30, 2021 NOK (kr) term_loan subsidiary vessel SecurityLoan shares	Jun. 30, 2021 EUR (€) term_loan subsidiary vessel SecurityLoan shares	Jan. 01, 2021 USD ($)	Dec. 31, 2020 NOK (kr) vessel	Dec. 31, 2020 EUR (€) vessel	May 31, 2019 USD ($)	Jan. 26, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.90%	3.80%	3.90%	3.90%		3.80%	3.80%
Total principal		$ 2,091,761,000	$ 2,087,083,000
Less unamortized discount and debt issuance costs		(23,042,000)	(31,976,000)
Total debt		2,068,719,000	2,055,107,000
Less current portion		(374,960,000)	(261,366,000)
Long-term debt (note 9)		1,693,759,000	1,793,741,000
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year		201,200,000
Long-term Debt, Maturities, Repayments of Principal in Year Two		429,500,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		326,300,000
Long-term Debt, Maturities, Repayments of Principal in Year Four		$ 187,400,000
Number Of Loan Agreements \| SecurityLoan		7		7	7
Secured Debt [Member]
Debt Instrument [Line Items]
Total principal		$ 892,200,000	$ 938,300,000
Number Of Debt Instruments \| term_loan		7
Number Of Debt Instruments With Balloon Or Bullet Payments \| term_loan		6		6	6
Number Of Vessels Held As Collateral \| vessel		19	20	19	19		20	20
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt, percentage bearing fixed interest, percentage rate		9.25%	9.25%	9.25%	9.25%		9.25%	9.25%	9.25%
Total principal		$ 243,395,000	$ 243,395,000
Debt instrument, principal amount									$ 250,000,000.0
Convertible Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, percentage bearing fixed interest, percentage rate		5.00%	5.00%	5.00%	5.00%		5.00%	5.00%
Norwegian Krone-denominated Bonds due through September 2025
Debt Instrument [Line Items]
Total principal		$ 354,486,000	$ 355,514,000
U.S. Dollar-denominated Term Loans due through 2030
Debt Instrument [Line Items]
Total principal		892,249,000	938,280,000
Euro-denominated Term Loans due through 2024
Debt Instrument [Line Items]
Total principal		134,447,000	152,710,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Total principal		112,184,000	112,184,000			$ 112,200,000
Total debt		110,600,000				$ 111,000,000.0
Debt Instrument, Convertible, Conversion Ratio	85.4701
Debt Instrument, Convertible, If-converted Value in Excess of Principal	$ 1,000
Debt Instrument, Convertible, Conversion Price \| $ / shares										$ 11.70
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	20.00%
Sale of Stock, Price Per Share \| $ / shares										$ 9.75
Revolving Credit Facilities due through 2024
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		883,900,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 528,900,000
Number Of Credit Facilities \| term_loan		4		4	4
Total principal		$ 355,000,000	$ 285,000,000
Line Of Credit Reduction Of Available Borrowing Capacity Remainder Of Fiscal Year		56,500,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Two		65,300,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Three		$ 201,300,000
Debt Instrument, Collateral, Number of Vessels \| vessel		33		33	33
Revolving Credit Facilities due through 2024 \| Secured Debt [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 150,000,000
Remaining Term Loans [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.26%		4.26%	4.26%
Minimum [Member]
Debt Instrument [Line Items]
Undrawn Revolving Credit Facilities Time To Maturity		6 months
Minimum [Member] \| Revolving Credit Facilities due through 2024
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.40%	1.40%
Maximum \| Revolving Credit Facilities due through 2024
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		4.25%	4.25%
Teekay LNG
Debt Instrument [Line Items]
Less current portion		$ (355,100,000)
Minimum Level Of Free Cash Maintained Per Loan Agreements		35,000,000.0
Teekay LNG \| Euro Denominated Term Loans Due Through Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Total debt		$ 134,400,000	$ 152,700,000		€ 113.4			€ 125.0
Debt Instrument, Collateral, Number of Vessels \| vessel		2		2	2
Number Of Debt Instruments \| term_loan		2
Number of Subsidiaries \| subsidiary		1		1	1
Teekay LNG \| Minimum [Member] \| Euro Denominated Term Loans Due Through Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.60%
Teekay LNG \| Maximum \| Euro Denominated Term Loans Due Through Two Thousand Twenty Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.95%
Teekay Tankers
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 29,800,000	32,000,000.0
Minimum Level Of Free Cash Maintained Per Loan Agreements		$ 35,000,000.0
Teekay Tankers \| Common Class A [Member] \| Revolving Credit Facilities due through 2024
Debt Instrument [Line Items]
Debt Collateral, Equity Interest in Subsidiaries, Number of Common Shares/Units \| shares		5.0		5.0	5.0
Parent Company [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Proceeds from Convertible Debt	$ 104,600,000
Debt instrument, principal amount										$ 125,000,000.0
Debt Instrument, Interest Rate, Stated Percentage										5.00%
Debt Instrument, Convertible, Carrying Amount of Equity Component										$ 16,100,000
Nibor Loan [Member] \| Teekay LNG \| Norwegian Kroner Denominated Bonds Due Through October Two Thousand Twenty One [Member] [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount \| kr				kr 3,100.0			kr 3,100.0
Senior Notes		$ 354,500,000	$ 355,500,000
Derivative, Notional Amount		$ 360,500,000
Nibor Loan [Member] \| Teekay LNG \| Minimum [Member] \| Norwegian Kroner Denominated Bonds Due Through October Two Thousand Twenty One [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		4.60%	4.60%
Derivative, Fixed Interest Rate		5.74%	5.74%	5.74%	5.74%		5.74%	5.74%
Nibor Loan [Member] \| Teekay LNG \| Maximum \| Norwegian Kroner Denominated Bonds Due Through October Two Thousand Twenty One [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		6.00%	6.00%
Derivative, Fixed Interest Rate		7.89%	7.89%	7.89%	7.89%		7.89%	7.89%
Fixed Rate [Member] \| Remaining Term Loans [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Number Of Debt Instruments \| term_loan		1
Three Month London Interbank Offered Rate [Member] \| Minimum [Member] \| Remaining Term Loans [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.85%
Three Month London Interbank Offered Rate [Member] \| Maximum \| Remaining Term Loans [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.25%
Debt Instrument, Redemption, Period One [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		104.625%
Debt Instrument, Redemption, Period Two [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.313%
Debt Instrument, Redemption, Period Three [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Transportation Equipment [Member] \| Long Term Debt1 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio		195.00%		195.00%	195.00%
Vessel Market Value to Loan Required Ratio		135.00%		135.00%	135.00%
Transportation Equipment [Member] \| Long Term Debt2 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio		289.00%		289.00%	289.00%
Vessel Market Value to Loan Required Ratio		125.00%		125.00%	125.00%
Transportation Equipment [Member] \| Long Term Debt3 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio		170.00%		170.00%	170.00%
Vessel Market Value to Loan Required Ratio		125.00%		125.00%	125.00%
Transportation Equipment [Member] \| Long Term Debt4 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio		145.00%		145.00%	145.00%
Vessel Market Value to Loan Required Ratio		120.00%		120.00%	120.00%