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Long-term debt - Additional Information (Detail) | Nov. 06, 2023 USD ($) | Nov. 01, 2023 USD ($) | Jul. 31, 2023 USD ($) | Mar. 13, 2023 USD ($) | Jan. 30, 2024 USD ($) | Jan. 12, 2024 USD ($) | Dec. 31, 2023 USD ($) | Oct. 27, 2023 USD ($) | Jun. 01, 2023 USD ($) | Apr. 25, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  | $ 766,886,000 |  |  |  |  |  |
Letters of credit issued |  |  |  |  |  |  | 469,100,000 |  |  |  |  |  | $ 465,200,000
Interest on long-term debt |  |  |  |  |  |  | 74,493,000 |  |  |  |  |  | $ 70,274,000
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repaid upon maturity |  |  | $ 75,000,000 | $ 15,000,000 |  |  |  |  |  |  |  |  |
Senior unsecured revolving credit facilities | Senior Unsecured Notes | Regulated Services Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Senior unsecured bank credit facilities | Senior Unsecured Notes | Regulated Services Group |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  | $ 610,400,000 |  |  |  |  |
Senior unsecured bank credit facilities | Senior Unsecured Notes | Regulated Services Group | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  | $ 489,600,000 |  |  |
Senior unsecured bank credit facilities | Senior Unsecured Notes | Regulated Services Group | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |
2029 Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 5.577% |  |  |  |  |  |  |
2029 Notes | Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 99.996% |  |  |  |  |  |  |
2034 Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 5.869% |  |  |  |  |  |  |
2034 Notes | Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  | 99.995% |  |  |  |  |  |  |
Securitized Utility Tariff Bonds due January 1, 2035 | Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  | $ 180,500,000 |  |  |  |  |  |  |  |
Percentage of public utilities, issuance of securitized tariff bonds |  |  |  |  | 0.04943 |  |  |  |  |  |  |  |
Securitized Utility Tariff Bonds due January 1, 2039 | Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |
Percentage of public utilities, issuance of securitized tariff bonds |  |  |  |  | 0.05091 |  |  |  |  |  |  |  |
Senior unsecured utility notes | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  | $ 137,000,000 |  |  |  |  |  |
Debt repaid upon maturity |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Floating Subordinated Notes - Series 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) | 6.875% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, redeemed amount | $ 287,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Syndicated Revolving Credit Facility Maturing On March 31, 2028 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 | $ 500,000,000 |
Letter of Credit | Renewable Energy Group |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued |  |  |  |  |  |  |  |  | $ 50,000,000 |  | $ 75,000,000 |  |

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