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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |
Other income (expense), net | $ 1,201 | $ (443) | $ 5,958 | $ 5,304
Income tax expense | (16,598) | (12,746) | (53,225) | (64,776)
Interest expense, net | (23,713) | (20,038) | (75,917) | (57,460)
Net income | 87,739 | 67,399 | 260,521 | 213,313
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 | 2,152 | 2,454
Income tax expense | (198) | (226) | (594) | (678)
Net income | 520 | 592 | 1,558 | 1,776
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) | (1,126) | (1,266)
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 | 3,278 | 3,720
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |
Income tax expense | (1,180) | (131) | (1,456) | (447)
Interest expense, net | 4,915 | 497 | 5,770 | 1,653
Net income | $ 3,735 | $ 366 | $ 4,314 | $ 1,206

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