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Shareholders' equity - change in accumulated other comprehensive income (loss), net of tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | $ 2,430,531 | $ 2,137,517
Ending Balance | 2,539,978 | 2,430,531
Cash Flow Hedges |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | 340 | (2,424)
Other comprehensive income (loss) before reclassifications | 2,574 | 2,775
Amounts reclassified from accumulated other comprehensive income (loss) | (2,107) | (11)
Net current-year other comprehensive income (loss) | 467 | 2,764
Ending Balance | 807 | 340
Pension and Other Postretirement Benefit Plans |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (138,808) | (136,596)
Other comprehensive income (loss) before reclassifications | 1,605 | (6,725)
Amounts reclassified from accumulated other comprehensive income (loss) | 5,823 | 4,513
Net current-year other comprehensive income (loss) | 7,428 | (2,212)
Ending Balance | (131,380) | (138,808)
Foreign Currency Translation Adjustment |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (126,623) | (299,697)
Other comprehensive income (loss) before reclassifications | (83,889) | 173,074
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0
Net current-year other comprehensive income (loss) | (83,889) | 173,074
Ending Balance | (210,512) | (126,623)
Accumulated Other Comprehensive Income (loss) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | (265,091) | (438,717)
Other comprehensive income (loss) before reclassifications | (79,710) | 169,124
Amounts reclassified from accumulated other comprehensive income (loss) | 3,716 | 4,502
Net current-year other comprehensive income (loss) | (75,994) | 173,626
Ending Balance | $ (341,085) | $ (265,091)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + 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 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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