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Supplemental Cash Flow Information - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 27, 2017 shares | Nov. 30, 2017 USD ($) | Aug. 31, 2015 USD ($) vessel shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) vessel shares
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Cash interest paid, including realized interest rate swap settlements |  |  |  | $ 319,600 | $ 341,000 | $ 318,100
Cash interest paid relating to interest rate swap amendments and terminations |  |  |  | 600 | 8,100 | 10,900
Cash of Tankers Investments Ltd. upon acquisition, net of transaction costs (note 4a) |  |  |  | 30,831 | 0 | $ 0
Number of common stock issued (in shares) | shares |  |  | 7,200,000 |  |  |
Number of common shares issued, noncash consideration |  |  | $ 49,300 |  |  |
Tanker Investments Ltd. | Teekay Tankers |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Cash of Tankers Investments Ltd. upon acquisition, net of transaction costs (note 4a) |  | $ 37,600 |  |  |  |
Legal fees |  | $ 6,800 |  |  |  |
Principal Maritime Tankers | Teekay Tankers | Suezmax |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Number of vessels | vessel |  |  | 12 |  |  |
Number of vessels acquired | vessel |  |  | 12 |  |  | 12
Aggregate purchase price |  |  | $ 661,300 |  |  | $ 661,300
Aggregate purchase price, cash |  |  | $ 612,000 |  |  | $ 612,000
Preferred Unitholders | Teekay Offshore |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Paid-in-kind distributions |  |  |  | $ 12,700 | $ 11,700 |
Class A | Tanker Investments Ltd. | Teekay Tankers |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Number of shares to be issued/exchanged (in shares) | shares | 88,977,544 |  |  |  |  |
Class A | Principal Maritime Tankers | Teekay Tankers |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Number of common stock issued (in shares) | shares |  |  |  |  |  | 7,200,000
Number of common shares issued, noncash consideration |  |  |  |  |  | $ 49,300
Class A | Principal Maritime Tankers | Teekay Tankers | Suezmax |  |  |  |  |  |
Schedule Of Supplemental Cash Flow [Line Items] |  |  |  |  |  |
Number of common stock issued (in shares) | shares |  |  | 13,600,000 |  |  |

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