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Investments - Teekay Tankers - Principal Maritime - Additional Information (Detail) shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) vessel shares | Dec. 31, 2015 USD ($) vessel shares | Dec. 31, 2014 USD ($) | Nov. 30, 2013 vessel
Net Investment Income [Line Items] |  |  |  |
Number of vessels | vessel |  |  |  | 5
Number of common stock issued (in shares) | shares | 7.2 |  |  |
Number of common shares issued, non cash consideration | $ 49.3 |  |  |
Teekay Parent [Member] | Class A [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Number of common stock issued (in shares) | shares | 4.5 |  |  |
Teekay Tankers [Member] | Principal Maritime Tankers [Member] | Class A [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Number of common stock issued (in shares) | shares |  | 7.2 |  |
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 acquired | vessel | 12 | 12 |  |
Number of vessels | vessel | 12 |  |  |
Aggregate purchase price | $ 661.3 | $ 661.3 |  |
Aggregate purchase price, cash | 612.0 |  | $ 612.0 |
Teekay Tankers [Member] | Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Due January 2016 [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Loan facility, amount | $ 397.2 |  |  |
Teekay Tankers [Member] | Suezmax Tankers [Member] | Principal Maritime Tankers [Member] | Class A [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Number of common stock issued (in shares) | shares | 13.6 |  |  |
Net proceeds from common stock | $ 90.6 |  |  |

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