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Accounting Policies - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |
Other income (expense), net | $ 2,177 |  | $ 2,171 |  | $ (6,051) | $ 4,757
Income tax expense | (41,400) |  | (10,503) |  | (59,923) | (36,627)
Interest expense, net | (58,560) |  | (31,920) |  | (103,129) | (52,204)
Net income | 102,854 | $ (4,013) | 83,271 | $ 87,457 | 98,841 | 170,728
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 | 726 |  | 718 |  | 1,452 | 1,435
Income tax expense | (176) |  | (198) |  | (351) | (396)
Net income | 550 |  | 520 |  | 1,101 | 1,039
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 | (366) |  | (375) |  | (732) | (751)
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 | $ 1,092 |  | 1,093 |  | $ 2,184 | 2,186
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |
Income tax expense |  |  | (42) |  |  | (276)
Interest expense, net |  |  | 176 |  |  | 855
Net income |  |  | $ 134 |  |  | $ 579

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