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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, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  |  |  |  |  | 200,000 | 100,000 |
Stock options granted (in shares) |  |  |  |  |  | 1,052,000 | 732,000 | 916,000
Stock option per share value (dollars per share) |  |  |  |  |  | $ 8.67 | $ 10.18 | $ 9.44
Non-Management Directors | Teekay Offshore |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 293,770 | 56,950 | 76,084
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 |  |  |  |  |  | 17,498 | 17,345 | 32,723
Non-Management Directors | Teekay Offshore Teekay LNG and Teekay Tankers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common units aggregate value, granted |  |  |  |  |  | $ 1.3 | $ 0.6 | $ 0.7
Phantom Unit Awards | Teekay Offshore |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares or units granted equity based compensation awards | 1,424,058 | 321,318 | 601,368 |  |  |  |  |
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 |  | 62,283 | 60,809 | 132,582 |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares or units granted equity based compensation awards |  |  |  |  |  | 616,397 | 349,175 | 238,609
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] |  |  |  |  |  |  |  |
Common units aggregate value, granted | $ 5.8 | $ 3.5 | $ 4.9 |  |  |  |  |
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) |  |  |  |  |  | 1,048,916 | 732,314 | 916,015
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) | 736,327 | 486,329 | 216,043 |  |  |  |  |
Stock option per share value (dollars per share) | $ 1.22 | $ 2.23 | $ 3.74 |  |  |  |  |
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) | 504,097 | 396,412 |  |  |  |  |  |
Stock option per share value (dollars per share) | $ 1.22 | $ 2.23 |  |  |  |  |  |
Stock option, term (in years) |  |  |  |  | 10 years |  |  |
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 |  |  |  |  |  | 168,029 | 0 | 9,358
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 | 762,640 | 382,437 | 279,980 |  |  |  |  |

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