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v3.20.1

Summary of Significant Accounting Policies - Vessels and equipment (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Interest Costs Capitalized |  | $ 300 | $ 14,800 | $ 36,300
Vessels and equipment |  |  |  |
Depreciation, Depletion and Amortization |  | 290,672 | 276,307 | 485,829
Asset retirement obligation |  |  |  |
Asset retirement obligation |  | 30,900 | 27,800 |
Goodwill, intangibles and other non-current assets (notes 6 and 16) |  | 133,466 | 179,270 |
Asset retirement obligation |  |  |  |
Asset retirement obligation |  |  |  |
Goodwill, intangibles and other non-current assets (notes 6 and 16) |  | $ 8,400 | 7,500 |
Liquefied Natural Gas |  |  |  |
Vessels and equipment |  |  |  |
Property, plant and equipment, useful life |  | 35 years |  |
Oil Tanker |  |  |  |
Vessels and equipment |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |
Liquefied Petroleum Gas |  |  |  |
Vessels and equipment |  |  |  |
Property, plant and equipment, useful life |  | 30 years |  |
Excluding amortization of Drydocking expenditure |  |  |  |
Vessels and equipment |  |  |  |
Depreciation, Depletion and Amortization |  | $ 239,900 | $ 244,000 | $ 397,600
Dry-docking activity |  |  |  |
Vessels and equipment |  |  |  |
Property, Plant and Equipment, Estimated Useful Lives |  | two and a half to five years |  |
Maximum | FPSO |  |  |  |
Vessels and equipment |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |
Petrojarl Banff [Member] | Service Life [Member] |  |  |  |
Vessels and equipment |  |  |  |
Property, plant and equipment, useful life | 11 months |  |  |
Depreciation |  | $ 1,700 |  |
Unusual or Infrequent Item, or Both, Earnings Per Share Impact, Net |  | $ 0.02 |  |

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