Net Loss Per Share - Schedule of Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net loss attributable to shareholders of Teekay Corporation for basic loss per share	$ (310,577)	$ (79,237)	$ (163,276)
The Company's portion of the Inducement Premium and Exchange Contribution charged to retained earnings by Teekay Offshore	0	0	(90)
Net loss attributable to shareholders of Teekay Corporation for diluted loss per share	$ (310,577)	$ (79,237)	$ (163,366)
Basic and Diluted (shares)	100,719,224	99,670,176	86,335,473
Dilutive effect of stock-based compensation (shares)	0	0	0
Common stock and common stock equivalents (shares)	100,719,224	99,670,176	86,335,473
Loss Per Share, Basic and Diluted	$ (3.08)	$ (0.79)	$ (1.89)

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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