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Capital Stock - Share-based Compensation of Subsidiaries (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) |  | 2,646,903 | 1,048,916
Stock option per share value (in usd per share) |  | $ 3.98 | $ 8.67
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 796,733 | 625,878
Vesting period |  | 3 years |
Stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 3 years |
Teekay LNG | Phantom unit awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 80,100 | 62,283
Teekay LNG | Non-management directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares) |  | 35,419 | 17,498
Teekay Tankers [Member] | Restricted stock units | Common Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 633,134 | 762,640
Teekay Tankers [Member] | Non-management directors | Common Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares) |  | 159,375 | 168,029
Teekay Tankers [Member] | Non-management directors | Stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options granted (in shares) | 504,097 |  | 470,765
Teekay Tankers [Member] | Officer | Stock option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Stock options granted (in shares) | 736,327 | 1,380,173 |
Stock option per share value (in usd per share) | $ 1.22 |  | $ 1.00
Maximum contractual term | 10 years |  |
Teekay LNG and Teekay Tankers [Member] | Restricted Stock And Phantom Share Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common units aggregate value, granted |  | $ 1.8 | $ 2.1
Teekay LNG and Teekay Tankers [Member] | Non-management directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common units aggregate value, granted |  | $ 0.7 | $ 0.5
Teekay Offshore Teekay Lng And Teekay Tankers | Restricted Stock And Phantom Share Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 3 years |

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