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Capital Stock - Capital Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Preferred stock, share authorized (in shares) |  | 25,000,000 |  | 25,000,000
Preferred stock, par value (in usd per share) |  | $ 1 |  | $ 1
Common stock, share authorized (in shares) |  | 725,000,000 |  | 725,000,000
Common stock, par value (in usd per share) |  | $ 0.001 |  | $ 0.001
Preferred stock, share issued (in shares) |  | 0 |  |
Net proceeds from equity issuances of subsidiaries |  | $ 0 | $ 8,521 |
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares) |  | 200,000 |  |
Stock options granted (in shares) |  | 1,048,916 | 732,314 |
Stock option per share value (in usd per share) |  | $ 8.67 | $ 10.18 |
Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 625,878 | 344,319 |
Fair value of granted stock |  | $ 5,400 | $ 3,500 |
Vesting period |  | 3 years |  |
Restricted stock awards |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 79,869 | 89,387 |
Fair value of granted stock |  | $ 700 | $ 900 |
Stock option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock option, term |  | 10 years |  |
Vesting period |  | 3 years |  |
Weighted-average grant-date fair value of options granted (in usd per share) | $ 4.21 |  |  |
Expected volatility used in computing fair value of options granted |  | 64.80% |  |
Expected life used in computing fair value of options granted, years |  | 5 years 6 months |  |
Dividend yield used in computing fair value of options granted |  | 2.50% |  |
Risk-free interest rate used in computing fair value of options granted |  | 2.60% |  |
Estimated forfeiture rate used in computing fair value of options granted |  | 7.40% |  |
Period of historical data used to calculate expected volatility in years |  | 5 years |  |
Teekay Parent | Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 10,000,000 |  |
Sale of stock, price per share (in USD per share) |  | $ 9.75 |  |
Net proceeds from equity issuances of subsidiaries |  | $ 93,000 |  |
Continuous Offering Program | Teekay Parent |  |  |  |
Class of Stock [Line Items] |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 1,100,000 |  |
Sale of stock, consideration received per transaction |  | $ 10,700 |  |

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