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Financial instruments - Derivative Instruments Designated as Amortized into Hedged Activity (Detail) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Sep. 29, 2023 USD ($)
--- | --- | --- | ---
Forward-starting interest rate swap |  |  |
Derivative [Line Items] |  |  |
Notional quantity |  |  | $ 390,000,000
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $350,000 subordinated unsecured notes | Designated as a hedge |  |  |
Derivative [Line Items] |  |  |
Notional quantity | $ 350,000,000 |  |
Par value | 350,000,000 |  |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $750,000 subordinated unsecured notes | Designated as a hedge |  |  |
Derivative [Line Items] |  |  |
Notional quantity | 750,000,000 |  |
Par value | 750,000,000 |  |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $1,150,000 senior unsecured notes | Designated as a hedge |  |  |
Derivative [Line Items] |  |  |
Notional quantity | 1,150,000,000 |  |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | First $575,000 of the $1,150,000 senior unsecured notes issuance | Designated as a hedge |  |  |
Derivative [Line Items] |  |  |
Notional quantity | 575,000,000 |  |
Par value | $ 575,000,000 |  |
Canadian dollar Senior unsecured notes | Cross-currency interest rate swap | C$400,000 subordinated unsecured notes | Designated as a hedge |  |  |
Derivative [Line Items] |  |  |
Cross-currency interest rate swap |  | $ 400,000 |
Par value |  | $ 400,000 |

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