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Segmented information - Information on Operations by Geographic Area (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |
Revenue | $ 1,624,921 | $ 1,648,463
Property, plant and equipment | 7,231,664 | 6,393,558
Intangible assets | 47,616 | 54,994
Canada |  |
Segment Reporting Information [Line Items] |  |
Revenue | 87,226 | 70,358
Property, plant and equipment | 752,016 | 415,979
Intangible assets | 23,795 | 23,994
United States |  |
Segment Reporting Information [Line Items] |  |
Revenue | 1,537,695 | 1,578,105
Property, plant and equipment | 6,479,648 | 5,977,579
Intangible assets | $ 23,821 | $ 31,000

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 + Details
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