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Regulatory matters - Regulatory Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | $ 1,327,683 | $ 1,271,501
Less: current regulatory assets | (142,970) | (190,393)
Non-current regulatory assets | 1,184,713 | 1,081,108
Total regulatory liabilities | 734,296 | 628,182
Less: current regulatory liabilities | (99,850) | (69,865)
Non-current regulatory liabilities | 634,446 | 558,317
Income taxes |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 290,121 | 312,671
Cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 185,786 | 191,173
Pension and post-employment benefits |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 104,636 | 68,085
Fuel and commodity cost adjustments |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 42,850 | 24,991
Clean energy and other customer programs |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 12,730 | 11,572
Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 2,078 | 343
Other |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 96,095 | 19,347
Fuel and commodity cost adjustments |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 326,418 | 388,294
Retired generating plant |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 183,732 | 174,609
Rate adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 192,880 | 136,198
Income taxes |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 101,939 | 97,414
Deferred capitalized costs |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 124,517 | 90,121
Pension and post-employment benefits |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 68,822 | 80,736
Environmental costs |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 66,779 | 70,529
Wildfire mitigation and vegetation management |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 64,146 | 66,156
Clean energy and other customer programs |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 37,214 | 28,145
Asset retirement obligation |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 26,620 | 27,172
Debt premium |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 18,995 | 24,888
Cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 11,084 | 11,084
Rate review costs |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 8,815 | 9,481
Long-term maintenance contract |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | 4,932 | 6,504
Other |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory assets | $ 90,790 | $ 60,170

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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