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Income Taxes - Tax Years Subject to Examination by Tax Authorities (Detail) | 12 Months Ended
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Dec. 31, 2018
Canada | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2011
Canada | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
Ecuador | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2015
Ecuador | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
Mexico | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2011
Mexico | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
Norway | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2013
Norway | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
Russia | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2015
Russia | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
Saudi Arabia | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2004
Saudi Arabia | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
United Kingdom | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2016
United Kingdom | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018
United States | Earliest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2015
United States | Latest Tax Year |
Income Tax Examination [Line Items] |
Income tax examination, year(s) under examination | 2018

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