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Pension and other postretirement benefits - Fair values of pension plan assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Minimum
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Effective average duration to maintain	3 years
Maximum
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Effective average duration to maintain	10 years
Fair Value, Measurements, Recurring
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	$ 10,532	$ 285,513
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	10,532	285,513
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	129	200,364
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	72,354
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	10,403	12,795
Fair Value, Measurements, Recurring | Cash | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	110	909
Fair Value, Measurements, Recurring | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	110	909
Fair Value, Measurements, Recurring | Cash | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Cash | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Money market funds | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	19	4,424
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	19	4,424
Fair Value, Measurements, Recurring | Money market funds | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		193,674
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		193,674
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Long duration bond fund | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		1,357
Fair Value, Measurements, Recurring | Long duration bond fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		1,357
Fair Value, Measurements, Recurring | Long duration bond fund | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Long duration bond fund | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		72,037
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		72,037
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Absolute return credit fund | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		317
Fair Value, Measurements, Recurring | Absolute return credit fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Absolute return credit fund | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		317
Fair Value, Measurements, Recurring | Absolute return credit fund | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Contract with insurance company | Fair Value, Inputs, Level 1, 2 and 3
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	10,403	12,795
Fair Value, Measurements, Recurring | Contract with insurance company | Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Contract with insurance company | Significant Observable Inputs (Level 2)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Contract with insurance company | Significant Unobservable Inputs (Level 3)
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets	$ 10,403	$ 12,795

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Fair Value of Plan Assets, Effective Average Duration

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
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