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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Other income (expense), net | $ 2,586 | $ 4,811
Income tax expense | (26,124) | (27,461)
Interest expense, net | (20,284) | (19,858)
Net income | 87,457 | 72,004
Reclassification out of Accumulated Other Comprehensive Income | Pension and post retirement benefit plans |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Other income (expense), net | 718 | 818
Income tax expense | (198) | (226)
Net income | 520 | 592
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Other income (expense), net | (375) | (422)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Other income (expense), net | 1,093 | 1,240
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Income tax expense | (231) | (163)
Interest expense, net | 679 | 589
Net income | $ 448 | $ 426

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