Other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Other Liabilities Disclosure [Abstract]
Accrued expenses	$ 100,323	$ 60,905
Accrued employee cost	4,341	2,854
Retirement benefits	16,188	13,843
Compensated absences	53,938	48,527
Derivative instruments	38,350	21,273
Contract liabilities	$ 61,168	$ 50,336
Finance lease, liability, noncurrent, statement of financial position [extensible list]	Other liabilities	Other liabilities
Finance leases liability	$ 10,115	$ 8,811
Deferred compensation plan liability	69,362	57,111
Others	6,261	5,381
Other liabilities	$ 360,046	$ 269,041

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the noncurrent portion of the liabilities (due beyond one year; or beyond one operating cycle if longer).

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