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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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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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	3 Months Ended			6 Months Ended
	Jul. 31, 2015 USD ($) Vessel $ / shares shares	Jul. 31, 2015 USD ($) $ / shares	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015
Net Investment Income [Line Items]
Equity income			$ 37,219		$ 39,901	$ 52,636	$ 60,650
Ship-to-ship transfer business [Member]
Net Investment Income [Line Items]
Joint venture ownership percentage								50.00%
Equity income		$ 8,700
Ship-to-ship transfer business [Member] \| Teekay Tankers [Member]
Net Investment Income [Line Items]
Purchase price of acquisition	$ 47,300
Goodwill, purchase accounting adjustments				$ 8,100
Finite-lived intangible assets, purchase accounting adjustments				$ (8,400)
Ship-to-ship transfer business [Member] \| Working Capital [Member] \| Teekay Tankers [Member]
Net Investment Income [Line Items]
Purchase price of acquisition	$ 1,800
Ship-to-ship Support Vessel [Member] \| Ship-to-ship transfer business [Member] \| Teekay Tankers [Member]
Net Investment Income [Line Items]
Number of vessels \| Vessel	6
Aframax Tanker [Member] \| Ship-to-ship transfer business [Member] \| Teekay Tankers [Member]
Net Investment Income [Line Items]
Number of vessels \| Vessel	1
Teekay [Member] \| Ship-to-ship transfer business [Member] \| Teekay Tankers [Member] \| Class B common stock [Member]
Net Investment Income [Line Items]
Number of common stock issued \| shares	6.5
Shares issued, price per share (usd per share) \| $ / shares	$ 6.99	$ 6.99