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Investments - Teekay Tankers - Principal Maritime - Additional Information (Detail) shares in Millions, $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2015 Vessel | Jun. 30, 2016 shares | Dec. 31, 2015 USD ($) shares
Net Investment Income [Line Items] |  |  |
Number of common stock issued | shares |  | 12.0 |
Teekay Tankers [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of common stock issued | shares |  |  | 7.2
Teekay Tankers [Member] | Class A common stock [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of common shares issued, non cash consideration |  |  | $ 49.3
Teekay Tankers [Member] | Suezmax Tankers [Member] | Principal Maritime Tankers [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of vessels | Vessel | 12 |  |
Aggregate purchase price |  |  | 661.3
Aggregate purchase price, cash |  |  | 612.0
Teekay Tankers [Member] | Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Due January 29, 2016 [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Loan facility, amount |  |  | $ 397.2
Teekay Tankers [Member] | Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Class A common stock [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of common stock issued | shares |  |  | 13.6
Net proceeds from common stock |  |  | $ 90.6
Teekay [Member] | Teekay Tankers [Member] | Class A common stock [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of common stock issued | shares |  |  | 4.5

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