Line items represent reporting 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.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Per share or per unit amount of equity securities issued.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Investments - Teekay Tankers - Ship-to-Ship Transfer Business - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions		1 Months Ended	12 Months Ended
	Jul. 31, 2015 vessel $ / shares	Jul. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) shares
Net Investment Income [Line Items]
Equity method investment, ownership interest			100.00%
Equity income			$ (37,344)	$ 85,639	$ 102,871
Ship-to-Ship Transfer Business (SPT) \| Teekay Tankers
Net Investment Income [Line Items]
Purchase price of acquisition		$ 47,300
Number of vessels \| vessel	6
Equity method investment, ownership interest					50.00%
Equity income					$ 8,700
Ship-to-Ship Transfer Business (SPT) \| Teekay Tankers \| Class B
Net Investment Income [Line Items]
Number of common stock issued (in shares) \| shares					6.5
Ship-to-Ship Transfer Business (SPT) \| Working Capital \| Class B
Net Investment Income [Line Items]
Number of common stock issued (in shares) \| shares		6.5
Ship-to-Ship Transfer Business (SPT) \| Working Capital \| Teekay Tankers
Net Investment Income [Line Items]
Purchase price of acquisition		$ 1,800
Ship-to-Ship Transfer Business (SPT) \| Working Capital \| Teekay Tankers \| Class B
Net Investment Income [Line Items]
Shares issued, price per share \| $ / shares	$ 6.99	$ 6.99
Ship-to-Ship Transfer Business (SPT) \| Aframax Tanker \| Teekay Tankers
Net Investment Income [Line Items]
Number of vessels \| vessel	1