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Segment Reporting - Capital Expenditures by Segment (Detail) - Operating Segments - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |
Total capital expenditures | $ 1,054,052 | $ 648,882
Teekay Parent | Other |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 7 | 88
Teekay Offshore |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 340,705 | 294,581
Teekay LNG | Liquefied Gas Carriers |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 708,608 | 344,924
Teekay LNG | Conventional Tankers |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | 0 | 63
Teekay Tankers | Conventional Tankers |  |
Segment Reporting Information [Line Items] |  |
Total capital expenditures | $ 4,732 | $ 9,226

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