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Capital Stock - Additional Information, Stock-based compensation of Subsidiaries (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  |  | 2,525,000 | 1,052,000 | 732,000
Stock option per share value (dollars per share) |  |  |  |  | $ 3.98 | $ 8.67 | $ 10.18
Non-Management Directors | Teekay LNG |  |  |  |  |  |  |
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 |  |  |  |  | 35,419 | 17,498 | 17,345
Non-Management Directors | Teekay Offshore Teekay LNG and Teekay Tankers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  | $ 0.7 | $ 0.5 | $ 0.3
Phantom Unit Awards | Teekay LNG |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares or units granted equity based compensation awards | 80,100 | 62,283 | 60,809 |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares or units granted equity based compensation awards |  |  |  |  | 808,391 | 625,878 | 349,175
Vesting period (in years) |  |  |  |  | 3 years |  |
Restricted Stock Units and Phantom Unit Awards | Teekay Offshore Teekay LNG and Teekay Tankers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | $ 2.0 | $ 2.1 | $ 1.8 |  |  |  |
Vesting period (in years) |  |  |  |  | 3 years |  |
Stock Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 3 years |  |
Stock options granted (in shares) |  |  |  |  | 2,525,113 | 1,048,916 | 732,314
Stock option, term (in years) |  |  |  |  | 10 years |  |
Stock Options | Officer | Teekay Tankers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period (in years) | 3 years |  |  |  |  |  |
Stock options granted (in shares) | 218,223 | 92,041 | 60,791 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price | $ 8.00 | $ 9.76 | $ 17.84 | $ 9.76 |  |  |
Stock option, term (in years) | 10 years |  |  |  |  |  |
Stock Options | Non-Management Directors | Teekay Tankers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock options granted (in shares) | 58,843 | 63,012 | 49,552 |  |  |  |
Stock option per share value (dollars per share) | $ 8.00 | $ 9.76 | $ 17.84 |  |  |  |
Stock option, term (in years) |  |  |  | 10 years |  |  |
Common Class A | Restricted Stock Units | Teekay Tankers |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares or units granted equity based compensation awards | 99,056 | 95,330 | 47,805 |  |  |  |
2007 LTIP [Member] | Common Class A | 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 |  |  |  |  |  | 21,004 |
2007 LTIP [Member] | Common Class A | Non-Management Directors | Teekay Tankers |  |  |  |  |  |  |
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 |  |  |  |  | 19,918 |  | 0

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