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Income Taxes - Tax Years Subject to Examination by Tax Authorities (Detail) | 12 Months Ended
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Dec. 31, 2020
Canada | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2013
Canada | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
Ecuador | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2016
Ecuador | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
Mexico | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2012
Mexico | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
Norway | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2015
Norway | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
Russia | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2016
Russia | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
Saudi Arabia | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2015
Saudi Arabia | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
United Kingdom | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2017
United Kingdom | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020
United States | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2017
United States | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2020

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