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

Debt Instrument, Convertible Term

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Reduction Of Available Borrowing Capacity In Year Four

+ References

No definition available.

+ Details

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Namespace Prefix:	tk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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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

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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

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

- Definition

Number Of Loan Agreements

+ References

No definition available.

+ Details

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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

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of Subsidiaries

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage over par at which notes sold.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Undrawn Revolving Credit Facilities Time To Maturity

+ References

No definition available.

+ Details

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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

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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

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Namespace Prefix:	tk_
Data Type:	num: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

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Data Type:	num:percentItemType
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

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Data Type:	num: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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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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.

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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.

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Period Type:	duration

- Definition

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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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

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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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

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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

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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-Paragraph 1B
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Name:	us-gaap_DerivativeNotionalAmount
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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.

+ References

+ Details

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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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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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.

+ References

+ Details

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Balance Type:	credit
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- 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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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

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- 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

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- 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

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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

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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 remainder of the 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

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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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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	debit
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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Long-Term Debt - Summary of Long-Term Debt (Detail) $ / shares in Units, shares in Thousands, € in Millions		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2020 USD ($) vessel term_loan shares subsidiary SecurityLoan	Dec. 31, 2019 USD ($) vessel	Oct. 01, 2020 USD ($)	Oct. 01, 2020 vessel	Oct. 01, 2020 shares	Sep. 30, 2020 NOK (kr) term_loan vessel shares subsidiary SecurityLoan	Sep. 30, 2020 EUR (€) term_loan vessel shares subsidiary SecurityLoan	Dec. 31, 2019 NOK (kr) vessel	Dec. 31, 2019 EUR (€) vessel	May 31, 2019 USD ($)	Jan. 26, 2018 USD ($) $ / shares	Jan. 27, 2010 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time			3.70%	4.60%				3.70%	3.70%	4.60%	4.60%
Total principal			$ 2,090,917,000	$ 2,867,120,000
Less unamortized discount and debt issuance costs			(36,045,000)	(39,968,000)
Total debt			2,054,872,000	2,827,152,000
Less current portion			(302,682,000)	(523,312,000)
Long-term portion			1,752,190,000	2,303,840,000
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			38,000,000.0
Long-term Debt, Maturities, Repayments of Principal in Year Two			423,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Three			474,000,000.0
Long-term Debt, Maturities, Repayments of Principal in Year Four			363,600,000
Long-term Debt, Maturities, Repayments of Principal in Year Five			258,400,000
Long-term Debt, Maturities, Repayments of Principal after Year Five			$ 533,000,000.0
Number Of Loan Agreements \| SecurityLoan			5					5	5
Secured Debt [Member]
Debt Instrument [Line Items]
Total principal			$ 962,800,000	$ 1,300,000,000
Number Of Debt Instruments \| term_loan			6
Number Of Debt Instruments With Balloon Or Bullet Payments \| term_loan			5					5	5
Number Of Vessels Held As Collateral \| vessel			20	24				20	20	24	24
Senior Notes (8.5%) due January 15, 2020
Debt Instrument [Line Items]
Percentage Of Par At Which Notes Sold		99.00%
Long-term debt, percentage bearing fixed interest, percentage rate		8.50%	0.085%	0.085%				0.085%	0.085%	0.085%	0.085%			8.50%
Total principal			$ 0	$ 36,712,000
Debt instrument, principal amount		$ 200,000,000												$ 450,000,000
Senior Notes due 2022 [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			$ 250,000,000	$ 250,000,000
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%
Total principal			$ 114,184,000	$ 125,000,000
Norwegian Krone-denominated Bonds due through September 2025
Debt Instrument [Line Items]
Total principal			326,820,000	347,163,000
U.S. Dollar-denominated Term Loans due through 2030
Debt Instrument [Line Items]
Total principal			962,757,000	1,336,437,000
Euro-denominated Term Loans due through 2024
Debt Instrument [Line Items]
Total principal			157,156,000	165,376,000
Other U.S. Dollar-denominated loan
Debt Instrument [Line Items]
Total principal			0	3,300,000
Revolving Credit Facilities
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity			928,200,000
Line of Credit Facility, Remaining Borrowing Capacity			$ 648,200,000
Number Of Credit Facilities \| term_loan			4					4	4
Line Of Credit Reduction Of Available Borrowing Capacity In Year Four			$ 65,300,000
Total principal			280,000,000	$ 603,132,000
Line Of Credit Reduction Of Available Borrowing Capacity Remainder Of Fiscal Year			135,000,000.0
Line Of Credit Reduction Of Available Borrowing Capacity In Year Two			115,800,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Three			$ 410,800,000
Debt Instrument, Collateral, Number of Vessels \| vessel			33					33	33
Revolving Credit Facilities \| Subsequent Event
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity					$ 957,600,000
Line of Credit Facility, Remaining Borrowing Capacity					677,600,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Four					65,300,000
Line Of Credit Reduction Of Available Borrowing Capacity Remainder Of Fiscal Year					47,200,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Two					115,800,000
Line Of Credit Reduction Of Available Borrowing Capacity In Year Three					$ 528,000,000.0
Revolving Credit Facilities \| 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%
Convertible Senior Notes due 2023 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
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
Minimum [Member]
Debt Instrument [Line Items]
Undrawn Revolving Credit Facilities Time To Maturity			6 months
Minimum [Member] \| Revolving Credit Facilities
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.40%	1.40%
Maximum \| Revolving Credit Facilities
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			3.95%	3.95%
Teekay LNG
Debt Instrument [Line Items]
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			$ 157,200,000	$ 165,400,000					€ 134.1		€ 147.5
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 \| Common Class A [Member] \| Revolving Credit Facilities
Debt Instrument [Line Items]
Debt Collateral, Equity Interest in Subsidiaries, Number of Common Shares/Units \| shares			25,200					25,200	25,200
Teekay LNG \| Thousands of Shares of Common Stock Outstanding \| Revolving Credit Facilities \| Subsequent Event
Debt Instrument [Line Items]
Debt Collateral, Equity Interest in Subsidiaries, Number of Common Shares/Units						10,750,000	10,750
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]
Minimum Level Of Free Cash Maintained Per Loan Agreements			$ 35,000,000.0
Teekay Tankers \| Common Class A [Member] \| Revolving Credit Facilities
Debt Instrument [Line Items]
Debt Collateral, Equity Interest in Subsidiaries, Number of Common Shares/Units \| shares			5,000					5,000	5,000
Parent Company [Member] \| Convertible Senior Notes due 2023 [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 Term	5 years
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 3,100,000,000
Unsecured Debt \| kr								kr 3,100,000,000		kr 3,100,000,000
Senior Notes			$ 326,800,000	$ 347,200,000
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%
Derivative, Fixed Interest Rate			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%
Derivative, Fixed Interest Rate			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			0.30%
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 due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			100.00%
Debt Instrument, Redemption, Period Two [Member] \| Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			104.625%
Debt Instrument, Redemption, Period Three [Member] \| Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			102.313%
Debt Instrument, Redemption, Period Four [Member] \| Senior Notes due 2022 [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			483.00%					483.00%	483.00%
Vessel Market Value to Loan Required Ratio			125.00%					125.00%	125.00%
Transportation Equipment [Member] \| Long Term Debt2 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio			234.00%					234.00%	234.00%
Vessel Market Value to Loan Required Ratio			115.00%					115.00%	115.00%
Transportation Equipment [Member] \| Long Term Debt3 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio			140.00%					140.00%	140.00%
Vessel Market Value to Loan Required Ratio			120.00%					120.00%	120.00%
Transportation Equipment [Member] \| Long Term Debt4 [Member]
Debt Instrument [Line Items]
Vessel Market Value To Loan Ratio			203.00%					203.00%	203.00%
Vessel Market Value to Loan Required Ratio			135.00%					135.00%	135.00%