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Equity Financing Transactions of the Daughter Companies - Summary of Proceeds Received from Financial Transactions (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |
Net cash proceeds | $ 0 | $ 0 | $ 172,930
Teekay Tankers | Continuous Offering Program |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 475,000
Sale of Stock, Consideration Received Per Transaction |  |  | $ 8,826
Less: Teekay Corporation Portion |  |  | 0
Offering Expenses |  |  | (305)
Net cash proceeds |  |  | $ 8,521
Teekay Tankers | Private Equity Placement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 269,396.5
Sale of Stock, Consideration Received Per Transaction |  |  | $ 5,000
Less: Teekay Corporation Portion |  |  | (5,000)
Offering Expenses |  |  | 0
Net cash proceeds |  |  | $ 0
Teekay Tankers | Direct Equity Placement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 1,721,903
Sale of Stock, Consideration Received Per Transaction |  |  | $ 25,897
Less: Teekay Corporation Portion |  |  | (25,897)
Offering Expenses |  |  | 0
Net cash proceeds |  |  | $ 0
Teekay Tankers | Direct Equity Placement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 11,122,193
Sale of Stock, Consideration Received Per Transaction |  |  | $ 151,262
Less: Teekay Corporation Portion |  |  | (14,025)
Offering Expenses |  |  | 0
Net cash proceeds |  |  | $ 137,237
Teekay Offshore | Private Equity Placement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 6,521,518
Sale of Stock, Consideration Received Per Transaction |  |  | $ 29,817
Less: Teekay Corporation Portion |  |  | (17,160)
Offering Expenses |  |  | (212)
Net cash proceeds |  |  | $ 12,445
Teekay LNG | Preferred Units Offering |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Number of shares / units |  |  | 6,800,000
Sale of Stock, Consideration Received Per Transaction |  |  | $ 170,000
Less: Teekay Corporation Portion |  |  | 0
Offering Expenses |  |  | (5,589)
Net cash proceeds |  |  | $ 164,411

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