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Summary of Significant Accounting Policies - Narrative (Detail) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 25, 2017 | Dec. 31, 2017 USD ($) vote vessel component segment partner | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 31, 2017
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Net investing cash flow |  | $ 1,054,171 | $ 530,519 | $ 1,823,278 |
Net financing cash flow |  | 417,884 | (200,662) | 918,934 |
Vessels and equipment |  |  |  |  |
Interest costs capitalized to vessels and equipment |  | $ 36,300 | 36,900 | 22,000 |
Number of segments | segment |  | 2 |  |  |
Depreciation and amortization |  | $ 485,829 | 571,825 | 509,500 |
Amortization of vessels accounted for as capital leases |  | 28,000 | 12,800 | 5,400 |
Asset retirement obligation |  |  |  |  |
Asset retirement obligation |  | 27,300 | 44,700 |  |
Other non-current assets |  | 83,211 | 190,699 |  |
Employee pension plans |  |  |  |  |
Cost recognized for defined contribution pension plans |  | 11,800 | 13,500 | 15,200 |
Funded status deficiency |  | $ 1,500 | 2,500 |  |
Norway |  |  |  |  |
Employee pension plans |  |  |  |  |
Percentage of ownership of defined benefit pension assets |  | 65.00% |  |  |
Australia |  |  |  |  |
Employee pension plans |  |  |  |  |
Percentage of ownership of defined benefit pension assets |  | 35.00% |  |  |
Asset retirement obligation |  |  |  |  |
Asset retirement obligation |  |  |  |  |
Other non-current assets |  | $ 7,400 | 27,900 |  |
Units for Maintenance and Safety |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 35 years |  |  |
Long Distance Towing and Offshore Installation |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |
Liquefied Natural Gas |  |  |  |  |
Operating revenues and expenses |  |  |  |  |
Number of vessels | vessel |  | 4 |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 35 years |  |  |
Tanker |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |
Shuttle |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 20 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 and amortization |  | $ 397,600 | 492,000 | $ 445,200 |
Maximum | FPSO |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years |  |  |
Maximum | Dry-docking activity |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 5 years |  |  |
Minimum | FPSO |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 20 years |  |  |
Minimum | Dry-docking activity |  |  |  |  |
Vessels and equipment |  |  |  |  |
Property, plant and equipment, useful life |  | 2 years 6 months |  |  |
Public Subsidiaries |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |
Teekay Offshore |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Number of components in segment | component |  | 2 |  |  |
Asset retirement obligation |  |  |  |  |
Asset retirement obligation |  |  | $ 21,700 |  |
Teekay Offshore | General Partner |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Interest of Company's general partner |  | 2.00% | 2.00% |  |
Teekay Tankers |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Common stock number of votes per share | vote |  | 5 |  |  |
Joint venture ownership percentage |  |  |  |  | 50.00%
Teekay Tankers | Class B |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Common stock, maximum voting power |  | 49.00% |  |  |
Teekay Offshore and Teekay LNG | General Partner |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Number of partners | partner |  | 1 |  |  |
Teekay LNG | General Partner |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Interest of Company's general partner |  | 2.00% |  |  |
Teekay Offshore |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |
Teekay Offshore | Common Units |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 13.80% | 27.50% |  |
Teekay Offshore | Series D Preferred Stock |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Joint venture ownership percentage |  | 74.00% |  |  |
Teekay Offshore | Preferred Unitholders |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Joint venture ownership percentage |  | 100.00% |  |  |
Teekay Tankers | Teekay Tankers |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 28.80% | 25.40% |  |
Teekay LNG |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 33.00% | 33.10% |  |
Teekay LNG | Liquefied Natural Gas |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Net investing cash flow |  |  | $ 355,000 |  |
Net financing cash flow |  |  | $ 355,000 |  |
Teekay LNG | Preferred Unitholders |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Joint venture ownership percentage |  | 100.00% |  |  |
GP of Teekay LNG and Teekay Offshore |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Ownership percentage |  | 100.00% |  |  |
General Partner | Brookfield |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Percentage of ownership acquired | 49.00% |  |  |  |
General Partner | Teekay Offshore |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Percentage of ownership acquired | 2.00% |  |  |  |
General Partner | Teekay Offshore |  |  |  |  |
Basis of presentation and Non-Controlling Interests |  |  |  |  |
Interest of Company's general partner | 100.00% |  |  |  |

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