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Pension and other postretirement benefits - amounts recognized in accumulated other comprehensive (income) loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, accumulated other comprehensive (income) loss, net of tax | $ 265,091 |  |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | 83,889 | $ (173,074) | $ 69,162
Ending balance, accumulated other comprehensive (income) loss, net of tax | 341,085 | 265,091 |
Pension |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | 51 | 79 |
Net amortization and deferral, prior service cost | (17) | (28) |
Settlements, prior service cost | 0 |  |
Actuarial changes in benefit obligation, prior service cost | 0 | 0 |
Curtailments, prior service cost (credit) | 0 |  |
Impact of currency translation, prior service cost (credit) | 0 | 0 |
Ending balance, prior service cost (credit) | 191 | 51 | 79
Beginning balance, net (gain) or loss | 209,314 | 209,706 |
Net amortization and deferral, net (gain) or loss | (6,760) | (6,706) |
Settlements, net gain (loss) | (486) |  |
Actuarial changes in benefit obligation, net gain (loss) | 4,495 | 4,818 |
Curtailments, Net (Gain) or Loss | (162) |  |
Impact of currency translation, net (gain) or loss | (682) | 1,496 |
Ending balance, net (gain) or loss | 205,719 | 209,314 | 209,706
Beginning balance, deferred taxes | (75,277) | (76,140) |
Net amortization and deferral, deferred taxes | 1,579 | 2,395 |
Settlements, deferred taxes | 83 |  |
Actuarial changes in benefit obligation, deferred taxes | (1,012) | (1,119) |
Curtailments, deferred taxes | 42 |  |
Impact of currency translation, deferred taxes | 183 | (413) |
Ending balance, deferred taxes | (74,429) | (75,277) | (76,140)
Beginning balance, accumulated other comprehensive (income) loss, net of tax | 134,088 | 133,645 |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | (5,198) | (4,339) |
Settlements, accumulated other comprehensive (income) loss, net of tax | (403) |  |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | 3,483 | 3,699 |
Curtailments, accumulated other comprehensive income (loss), net of tax | (120) |  |
Impact of currency translation, accumulated other comprehensive (income) loss, net of tax | (499) | 1,083 |
Defined benefit plan, plan amendments and prior service costs | 157 |  |
Defined benefit plan, net (gain) or loss on plan amendments | 0 |  |
Defined benefit plan, plan amendments on deferred taxes | (27) |  |
Plan amendments in benefit obligation, accumulated other comprehensive income loss, net of tax | (130) |  |
Ending balance, accumulated other comprehensive (income) loss, net of tax | 131,481 | 134,088 | 133,645
Other Benefits |  |  |
Defined Benefit Plan, Chance in Amounts Recognized in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Beginning balance, prior service cost (credit) | 305 | 85 |
Net amortization and deferral, prior service cost | (77) | (77) |
Actuarial changes in benefit obligation, prior service cost | 0 | 0 |
Curtailments, prior service cost (credit) | (157) |  |
Ending balance, prior service cost (credit) | 71 | 305 | 85
Beginning balance, net (gain) or loss | 6,410 | 4,330 |
Net amortization and deferral, net (gain) or loss | (59) | (198) |
Actuarial changes in benefit obligation, net gain (loss) | (6,058) | 2,278 |
Curtailments, Net (Gain) or Loss | 0 |  |
Ending balance, net (gain) or loss | 293 | 6,410 | 4,330
Beginning balance, deferred taxes | (1,995) | (1,464) |
Net amortization and deferral, deferred taxes | 32 | 101 |
Actuarial changes in benefit obligation, deferred taxes | 1,459 | (558) |
Curtailments, deferred taxes | 39 |  |
Ending balance, deferred taxes | (465) | (1,995) | (1,464)
Beginning balance, accumulated other comprehensive (income) loss, net of tax | 4,720 | 2,951 |
Net amortization and deferral, accumulated other comprehensive (income) loss, net of tax | (104) | (174) |
Actuarial changes in benefit obligation, accumulated other comprehensive income (loss), net of tax | (4,599) | 1,720 |
Curtailments, accumulated other comprehensive income (loss), net of tax | (118) |  |
Defined benefit plan, plan amendments and prior service costs |  | 297 |
Defined benefit plan, net (gain) or loss on plan amendments |  | 0 |
Defined benefit plan, plan amendments on deferred taxes |  | (74) |
Plan amendments in benefit obligation, accumulated other comprehensive income loss, net of tax |  | (223) |
Ending balance, accumulated other comprehensive (income) loss, net of tax | $ (101) | $ 4,720 | $ 2,951

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation 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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82918529&loc=d3e30304-110892 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32022-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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