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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, 2017 | Mar. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Cost of sales | $ 646,327 | $ 516,851
Income from Operations | 99,465 | 137,464
Income tax expense | (27,461) | (43,301)
Interest expense, net | (17,712) | (4,871)
Net income attributable to Wabtec shareholders | 73,889 | 94,163
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] |  |
Income from Operations | 818 | 735
Income tax expense | (226) | (231)
Net income attributable to Wabtec shareholders | 592 | 504
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] |  |
Cost of sales | (422) | (385)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Cost of sales | 1,240 | 1,120
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |
Income tax expense | (163) | (149)
Interest expense, net | 589 | 474
Net income attributable to Wabtec shareholders | $ 426 | $ 325

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