| **Accumulated other comprehensive loss - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands** | 3 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **AOCI Attributable to Parent, Net of Tax [Roll Forward]**                                                                   |           |   |
| Beginning balance                                                                                                            | $ 2,932,192    | $ 2,598,060 |
| Pension and other postretirement plan adjustments, net of tax of $163                                                        | (512)          |   |
| Foreign currency translation adjustments (a)                                                                                 | (51,679)       | 43,943 |
| Ending balance                                                                                                               | 2,876,611      | 2,723,967 |
| Amortization of prior service costs and net actuarial losses, tax                                                            | 163            |   |
| Other Comprehensive Income (Loss), Net Investment Hedge, Tax                                                                 | (8,518)        |   |
| Other Comprehensive Income (Loss), Net Investment Hedge, Gross                                                               | 28,520         |   |
| Accumulated Other Comprehensive Income (Loss)                                                                                |           |   |
| **AOCI Attributable to Parent, Net of Tax [Roll Forward]**                                                                   |           |   |
| Beginning balance                                                                                                            | (184,840)      | (196,441) |
| Foreign currency translation adjustments (a)                                                                                 | (51,679)       | 43,943 |
| Ending balance                                                                                                               | (236,007)      | $ (152,957) |
| Cumulative translation adjustments                                                                                           |           |   |
| **AOCI Attributable to Parent, Net of Tax [Roll Forward]**                                                                   |           |   |
| Beginning balance                                                                                                            | (116,890)      |   |
| Pension and other postretirement plan adjustments, net of tax of $163                                                        | 0              |   |
| Foreign currency translation adjustments (a)                                                                                 | (51,679)       |   |
| Ending balance                                                                                                               | (168,569)      |   |
| Pension and postretirement  benefit plan adjustments                                                                    |           |   |
| **AOCI Attributable to Parent, Net of Tax [Roll Forward]**                                                                   |           |   |
| Beginning balance                                                                                                            | (67,950)       |   |
| Pension and other postretirement plan adjustments, net of tax of $163                                                        | (512)          |   |
| Foreign currency translation adjustments (a)                                                                                 | 0              |   |
| Ending balance                                                                                                               | $ (67,438)     |   |

| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit) and Settlement, after Tax
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| - Definition
Other Comprehensive Income (Loss), Net Investment Hedge, Total
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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.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after 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.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.
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| - Definition
Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.
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