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Fair Value Measurements - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 25, 2017 day $ / shares | Aug. 11, 2014 USD ($) | Jun. 30, 2016 MaintenanceAndSafety | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares | Jun. 29, 2016 $ / shares | Dec. 31, 2015 $ / shares | Jan. 31, 2014 shares
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |
Teekay Offshore |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants (in usd per unit) | $ / shares | $ 0.01 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 4.00 |  |  |  |  |  |  |
Trading period | day | 10 |  |  |  |  |  |  |
Warrant term | 7 years |  |  |  |  |  |  |
Logitel Offshore Holdings | Cancellation Potential | Newbuildings |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Number of units for maintenance and safety | MaintenanceAndSafety |  |  | 2 |  |  |  |  |
Teekay Offshore | Logitel Offshore Holdings |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership acquired |  | 100.00% |  |  |  |  |  |
Aggregate purchase price, cash | $ |  | $ 4.0 |  |  |  |  |  |
Potential additional cash amount for purchase price | $ |  | $ 27.6 |  |  |  |  |  |
Tanker Investments Ltd. | Stock Purchase Warrants | Maximum |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant | shares |  |  |  |  |  |  |  | 1,500,000
Stock Purchase Warrants | Teekay Corporation | Brookfield |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant | shares |  |  |  | 14,500,000 |  |  |  |
Series D Warrant |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant | shares |  |  |  | 1,755,000 |  |  |  |
Warrant term |  |  |  | 7 years |  |  |  |
Series D Warrant | Teekay Offshore |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Stock purchase warrants | $ |  |  |  | $ 1.3 |  |  |  |
Series D Warrant | Teekay Offshore |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Volatility rate |  |  |  | 74.90% |  |  |  |
Series B | Teekay Offshore |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants (in usd per unit) | $ / shares | $ 4.55 |  |  | $ 4.55 |  | $ 6.05 |  |
Brookfield Transaction | Stock Purchase Warrants | Teekay Offshore |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Stock purchase warrants | $ |  |  |  | $ 29.4 |  |  |  |

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