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Write-down and loss on sale of vessels - Additional Information - Asset Impairments (Detail) $ in Thousands	1 Months Ended			12 Months Ended
	Feb. 28, 2021 USD ($) credit_facility	Jan. 31, 2020 credit_facility	Jun. 30, 2018 credit_facility	Dec. 31, 2020 USD ($) vessel	Dec. 31, 2019 USD ($) vessel	Dec. 31, 2018 USD ($)	Feb. 05, 2021 vessel
Property, Plant and Equipment [Line Items]
Gain on commencement of sales-type lease (note 2)				$ 44,943	$ 0	$ 0
Teekay Tankers \| Conventional Tankers \| Ship-to-Ship Transfer Business (SPT)
Property, Plant and Equipment [Line Items]
Proceeds from Divestiture of Businesses				27,100
Proceeds From Divestiture Of Businesses Adjustment				$ 1,100
FPSO \| Offshore Production
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel				2
FPSO \| Teekay Parent [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel				1
FPSO \| Teekay Parent [Member] \| Offshore Production
Property, Plant and Equipment [Line Items]
Write down on vessel				$ 70,693	$ 175,000	0
FPSO \| Teekay Parent [Member] \| FPSO
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel				2	1
LNG Carriers \| Teekay LNG
Property, Plant and Equipment [Line Items]
Number Of Vessels Sold \| credit_facility		2
LNG Carriers \| Teekay LNG \| Liquefied Gas Segment [Member]
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel				7
Write down on vessel				$ 51,000	$ 0	33,000
Number Of Vessels Sold \| vessel					2
Aframax Tanker [Member] \| Teekay Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired \| vessel				9
Write down on vessel				$ 65,400
Suezmax \| Teekay Tankers \| Conventional Tankers
Property, Plant and Equipment [Line Items]
Number Of Vessels Sold \| vessel				3	3
Multi-gas carrier \| Teekay LNG
Property, Plant and Equipment [Line Items]
Number Of Vessels Impaired			4	7
Petrojarl Foinaven FPSO
Property, Plant and Equipment [Line Items]
Gain on commencement of sales-type lease (note 2)				$ 44,900
Petrojarl Foinaven FPSO \| Teekay Parent [Member] \| Offshore Production
Property, Plant and Equipment [Line Items]
Write down on vessel				$ 0	$ 3,330	$ 0
Subsequent Events \| Teekay Tankers \| Aframax Tanker [Member]
Property, Plant and Equipment [Line Items]
Number of vessels \| vessel							2
Proceeds from Sale of Productive Assets	$ 32,000
Number Of Vessels Sold \| credit_facility	2