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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, accumulated other comprehensive (income) loss, net of tax | $ 403,522 |  |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | (44,902) | $ 62,904 | $ 63,191
Ending balance, accumulated other comprehensive (income) loss, net of tax | 314,405 | 403,522 |
Pension |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | 200 | 200 |
Net amortization and deferral, prior service cost | (9) | 0 |
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 | 200 | 200
Beginning balance, net (gain) or loss | 219,355 | 217,939 |
Net amortization and deferral, net (gain) or loss | (8,527) | (7,900) |
Actuarial changes in benefit obligation, net gain (loss) | (47,453) | 10,724 |
Impact of currency translation, net (gain) or loss | 573 | (1,408) |
Ending balance, net (gain) or loss | 163,948 | 219,355 | 217,939
Beginning balance, deferred taxes | (77,347) | (77,273) |
Net amortization and deferral, deferred taxes | 1,961 | 1,832 |
Actuarial changes in benefit obligation, deferred taxes | 10,805 | (2,271) |
Impact of currency translation, deferred taxes | (139) | 365 |
Ending balance, deferred taxes | (64,720) | (77,347) | (77,273)
Beginning balance, accumulated other comprehensive (income) loss, net of tax | 142,208 | 140,866 |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | (6,575) | (6,068) |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | (36,648) | 8,453 |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | 434 | (1,043) |
Ending balance, accumulated other comprehensive (income) loss, net of tax | 99,419 | 142,208 | 140,866
Other Benefits |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | (2,635) | (3,652) |
Net amortization and deferral, prior service cost | 1,017 | 1,017 |
Actuarial changes in benefit obligation, prior service cost | 0 | 0 |
Ending balance, prior service cost (credit) | (1,618) | (2,635) | (3,652)
Beginning balance, net (gain) or loss | (5,177) | 805 |
Net amortization and deferral, net (gain) or loss | 547 | 241 |
Actuarial changes in benefit obligation, net gain (loss) | (7,996) | (6,223) |
Ending balance, net (gain) or loss | (12,626) | (5,177) | 805
Beginning balance, deferred taxes | 1,403 | 271 |
Net amortization and deferral, deferred taxes | (359) | (287) |
Actuarial changes in benefit obligation, deferred taxes | 1,830 | 1,419 |
Ending balance, deferred taxes | 2,874 | 1,403 | 271
Beginning balance, accumulated other comprehensive (income) loss, net of tax | (6,409) | (2,576) |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | 1,205 | 971 |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | (6,166) | (4,804) |
Ending balance, accumulated other comprehensive (income) loss, net of tax | $ (11,370) | $ (6,409) | $ (2,576)

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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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