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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |
Other income (expense), net | $ 2,171 | $ 936 | $ 4,757 | $ 5,747
Income tax expense | (10,503) | (24,569) | (36,627) | (52,030)
Interest expense, net | (31,920) | (17,564) | (52,204) | (37,422)
Net income attributable to Wabtec shareholders | 84,416 | 72,025 | 172,782 | 145,914
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 | 1,435 | 1,636
Income tax expense | (198) | (226) | (396) | (452)
Net income attributable to Wabtec shareholders | 520 | 592 | 1,039 | 1,184
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) | (751) | (844)
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 | 2,186 | 2,480
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) | (149) | (276) | (312)
Interest expense, net | 176 | 566 | 855 | 1,155
Net income attributable to Wabtec shareholders | $ 134 | $ 417 | $ 579 | $ 843

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