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Commitments and Contingencies - Additional Information - Vessels Under Construction (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Long-term Purchase Commitment [Line Items] |  |  |  |
Carrying amount of long-term debt |  | $ 2,867,120 | $ 3,363,127 |
Net loss |  | (148,986) | (57,747) | $ (529,072)
Teekay LNG |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Unrecorded Unconditional Purchase Obligation |  | 61,003 |  |
Unrecorded Unconditional Purchase Obligation, Due within next Twelve Months |  | 23,330 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 22,382 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 15,291 |  |
Net loss |  | 164,604 | $ 76,875 | $ (1,089)
Consolidated Entities [Member] | Teekay LNG |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Unrecorded Unconditional Purchase Obligation |  | 49,652 |  |
Unrecorded Unconditional Purchase Obligation, Due within next Twelve Months |  | 11,979 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 22,382 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | 15,291 |  |
Expected cost of project | $ 61,000 |  |  |
Equity Method Investments [Member] | Teekay LNG |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Unrecorded Unconditional Purchase Obligation |  | 11,351 |  |
Unrecorded Unconditional Purchase Obligation, Due within next Twelve Months |  | 11,351 |  |
Unrecorded Unconditional Purchase Obligation, Due within Two Years |  | 0 |  |
Unrecorded Unconditional Purchase Obligation, Due within Three Years |  | $ 0 |  |

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