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Fair value measurements - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of postretirement benefit plan assets comprised of pension plan assets (more than)	96.00%
Level 2 | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in preferred stock	$ 21,212

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Percentage of postretirement benefit plan assets in company's pension plan assets.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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