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Income taxes - Tax Effect on Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Deferred tax assets: |  |  |
Non-capital loss, investment tax credits, currently non-deductible interest expenses, and financing costs | $ 1,030,801 | $ 878,000 |
Pension and OPEB | 7,370 | 16,845 |
Environmental obligation | 11,692 | 12,118 |
Regulatory liabilities | 180,371 | 156,285 |
Other | 72,109 | 61,917 |
Total deferred income tax assets | 1,302,343 | 1,125,165 |
Less: valuation allowance | (97,344) | (107,583) | $ (27,471)
Total deferred tax assets | 1,204,999 | 1,017,582 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | 883,447 | 846,331 |
Outside basis differentials | 364,511 | 315,581 |
Regulatory accounts | 317,820 | 303,059 |
Other | 59,640 | 33,834 |
Total deferred tax liabilities | 1,625,418 | 1,498,805 |
Net deferred tax liabilities | (420,419) | (481,223) |
Deferred tax assets | 158,483 | 84,416 |
Deferred tax liabilities | $ (578,902) | $ (565,639) |

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