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Shareholders' equity - change in accumulated other comprehensive income (loss), net of tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | $ (438,717) |
Ending balance, accumulated other comprehensive income (loss), net of tax | (265,091) | $ (438,717)
Acquisition of noncontrolling interest |  | (9,231)
Cash Flow Hedges |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (2,424) | (2,491)
Other comprehensive income (loss) before reclassifications | 2,775 | (3,434)
Amounts reclassified from accumulated other comprehensive income (loss) | (11) | 3,501
Net current-year other comprehensive income (loss) | 2,764 | 67
Ending balance, accumulated other comprehensive income (loss), net of tax | 340 | (2,424)
Pension and Other Postretirement Benefit Plans |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (136,596) | (138,887)
Other comprehensive income (loss) before reclassifications | (6,725) | (2,221)
Amounts reclassified from accumulated other comprehensive income (loss) | 4,513 | 4,512
Net current-year other comprehensive income (loss) | (2,212) | 2,291
Ending balance, accumulated other comprehensive income (loss), net of tax | (138,808) | (136,596)
Foreign Currency Translation Adjustment |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (299,697) | (229,746)
Other comprehensive income (loss) before reclassifications | 173,074 | (69,119)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Net current-year other comprehensive income (loss) | 173,074 | (69,119)
Ending balance, accumulated other comprehensive income (loss), net of tax | (126,623) | (299,697)
Acquisition of noncontrolling interest |  | (832)
Accumulated Other Comprehensive Income (loss) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning balance, accumulated other comprehensive income (loss), net of tax | (438,717) | (371,124)
Other comprehensive income (loss) before reclassifications | 169,124 | (74,774)
Amounts reclassified from accumulated other comprehensive income (loss) | 4,502 | 8,013
Net current-year other comprehensive income (loss) | 173,626 | (66,761)
Ending balance, accumulated other comprehensive income (loss), net of tax | $ (265,091) | (438,717)
Acquisition of noncontrolling interest |  | $ (832)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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