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Pension and other postretirement benefits - Amounts recognized in accumulated other comprehensive (income) loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, accumulated other comprehensive (income) loss, net of tax | $ 314,405 |  |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | 92,594 | $ (44,902) | $ 62,904
Ending balance, accumulated other comprehensive (income) loss, net of tax | 316,669 | 314,405 |
Pension |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | 191 | 200 |
Net amortization and deferral, prior service cost | 0 | (9) |
Actuarial changes in benefit obligation, prior service cost | 0 | 0 |
Impact of currency translation, prior service cost (credit) | 0 | 0 |
Ending balance, prior service cost (credit) | 191 | 191 | 200
Beginning balance, net (gain) or loss | 163,948 | 219,355 |
Net amortization and deferral, net (gain) or loss | (1,849) | (8,527) |
Actuarial changes in benefit obligation, net gain (loss) | (149,294) | (47,453) |
Impact of currency translation, net (gain) or loss | (319) | 573 |
Ending balance, net (gain) or loss | 12,486 | 163,948 | 219,355
Beginning balance, deferred taxes | (64,720) | (77,347) |
Net amortization and deferral, deferred taxes | 446 | 1,961 |
Actuarial changes in benefit obligation, deferred taxes | 60,645 | 10,805 |
Impact of currency translation, deferred taxes | 86 | (139) |
Ending balance, deferred taxes | (3,543) | (64,720) | (77,347)
Beginning balance, accumulated other comprehensive (income) loss, net of tax | 99,419 | 142,208 |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | (1,403) | (6,575) |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | (88,649) | (36,648) |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | (233) | 434 |
Ending balance, accumulated other comprehensive (income) loss, net of tax | 9,134 | 99,419 | 142,208
Other Benefits |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | (1,618) | (2,635) |
Net amortization and deferral, prior service cost | 1,967 | 1,017 |
Actuarial changes in benefit obligation, prior service cost | 0 | 0 |
Ending balance, prior service cost (credit) | 349 | (1,618) | (2,635)
Beginning balance, net (gain) or loss | (12,626) | (5,177) |
Net amortization and deferral, net (gain) or loss | 697 | 547 |
Actuarial changes in benefit obligation, net gain (loss) | (2,150) | (7,996) |
Ending balance, net (gain) or loss | (14,079) | (12,626) | (5,177)
Beginning balance, deferred taxes | 2,874 | 1,403 |
Net amortization and deferral, deferred taxes | (609) | (359) |
Actuarial changes in benefit obligation, deferred taxes | 493 | 1,830 |
Ending balance, deferred taxes | 2,758 | 2,874 | 1,403
Beginning balance, accumulated other comprehensive (income) loss, net of tax | (11,370) | (6,409) |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | 2,055 | 1,205 |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | (1,657) | (6,166) |
Ending balance, accumulated other comprehensive (income) loss, net of tax | $ (10,972) | $ (11,370) | $ (6,409)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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