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Equity Financing Transactions of the Daughter Companies - Summary of Proceeds Received from Financial Transactions (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Net cash proceeds |  | $ 172,930,000 | $ 327,419,000 | $ 575,368,000
Continuous Offering Program |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 2,900,000 | 1,300,000 |
Gross proceeds received |  |  | $ 50,000,000.0 |
Offering Expenses |  | $ (400,000) |  |
Net cash proceeds |  | $ 25,600,000 | $ 9,300,000 |
Teekay Tankers | Continuous Offering Program |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 3,800,000 | 3,020,000 | 13,391,100
Gross proceeds received |  | $ 8,826,000 | $ 7,747,000 | $ 94,595,000
Less: Teekay Corporation Portion |  | 0 | 0 | 0
Offering Expenses |  | (305,000) | (189,000) | (2,155,000)
Net cash proceeds |  | $ 8,521,000 | $ 7,558,000 | $ 92,440,000
Teekay Tankers | Private Equity Placement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 2,155,172 |  | 13,310,158
Gross proceeds received |  | $ 5,000,000 |  | $ 109,907,000
Less: Teekay Corporation Portion |  | (5,000,000) |  | 0
Offering Expenses |  | 0 |  | 0
Net cash proceeds |  | $ 0 |  | $ 109,907,000
Teekay Tankers | Direct Equity Placement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 13,775,224 |  |
Gross proceeds received |  | $ 25,897,000 |  |
Less: Teekay Corporation Portion |  | (25,897,000) |  |
Offering Expenses |  | 0 |  |
Net cash proceeds |  | $ 0 |  |
Teekay Tankers | Direct Equity Placement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 88,977,544 |  |
Gross proceeds received |  | $ 151,262,000 |  |
Less: Teekay Corporation Portion |  | (14,025,000) |  |
Offering Expenses |  | 0 |  |
Net cash proceeds |  | $ 137,237,000 |  |
Teekay Tankers | Public Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  |  | 3,000,000
Gross proceeds received |  |  |  | $ 13,716,000
Less: Teekay Corporation Portion |  |  |  | 0
Offering Expenses |  |  |  | (31,000)
Net cash proceeds |  |  |  | $ 13,685,000
Teekay Offshore | Continuous Offering Program |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  | 5,525,310 | 211,077
Gross proceeds received |  |  | $ 31,819,000 | $ 3,551,000
Less: Teekay Corporation Portion |  |  | (636,000) | (71,000)
Offering Expenses |  |  | (792,000) | (66,000)
Net cash proceeds |  |  | 30,391,000 | $ 3,414,000
Teekay Offshore | Private Equity Placement |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 6,521,518 |  |
Gross proceeds received |  | $ 29,817,000 | 24,874,000 |
Less: Teekay Corporation Portion |  | (17,160,000) | (13,167,000) |
Offering Expenses |  | (212,000) | 0 |
Net cash proceeds |  | $ 12,445,000 | 11,707,000 |
Teekay Offshore | Preferred D Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Gross proceeds received |  |  | 100,000,000 |
Less: Teekay Corporation Portion | $ (26,000,000) |  | (26,000,000) |
Offering Expenses |  |  | (2,750,000) |
Net cash proceeds | $ 71,300,000 |  | $ 71,250,000 |
Teekay Offshore | Common Units Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  | 21,978,022 |
Gross proceeds received |  |  | $ 102,041,000 |
Less: Teekay Corporation Portion |  |  | (2,041,000) |
Offering Expenses |  |  | (2,550,000) |
Net cash proceeds |  |  | $ 97,450,000 |
Teekay Offshore | Preferred B Units Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  |  | 5,000,000
Gross proceeds received |  |  |  | $ 125,000,000
Less: Teekay Corporation Portion |  |  |  | 0
Offering Expenses |  |  |  | (4,210,000)
Net cash proceeds |  |  |  | $ 120,790,000
Teekay Offshore | Preferred C Units Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  |  | 10,400,000
Gross proceeds received |  |  |  | $ 250,000,000
Less: Teekay Corporation Portion |  |  |  | 0
Offering Expenses |  |  |  | (250,000)
Net cash proceeds |  |  |  | $ 249,750,000
Teekay LNG | Continuous Offering Program |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  |  |  | 1,173,428
Gross proceeds received |  |  |  | $ 36,274,000
Less: Teekay Corporation Portion |  |  |  | (725,000)
Offering Expenses |  |  |  | (900,000)
Net cash proceeds |  |  |  | $ 34,649,000
Teekay LNG | Preferred Units Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares / units |  | 6,800,000 | 5,000,000 |
Gross proceeds received |  | $ 170,000,000 | $ 125,000,000 |
Less: Teekay Corporation Portion |  | 0 | 0 |
Offering Expenses |  | (5,589,000) | (4,293,000) |
Net cash proceeds |  | $ 164,411,000 | $ 120,707,000 |

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