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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | $ (112,235) | $ (77,884) | $ (50,298)
Income tax expense |  |  |  |  |  |  |  |  | (75,879) | (89,773) | (99,433)
Net income attributable to Wabtec shareholders | $ 34,423 | $ 87,739 | $ 84,416 | $ 88,366 | $ 48,948 | $ 67,399 | $ 72,025 | $ 73,889 | 294,944 | 262,261 | $ 304,887
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, net |  |  |  |  |  |  |  |  | (1,501) | (1,496) |
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain) |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 4,327 | 5,037 |
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, net |  |  |  |  |  |  |  |  | 2,826 | 3,541 |
Income tax expense |  |  |  |  |  |  |  |  | (763) | (979) |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 2,063 | 2,562 |
Reclassification out of Accumulated Other Comprehensive Income | Derivative contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 4,915 | 400 |
Income tax expense |  |  |  |  |  |  |  |  | (1,180) | (140) |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 3,735 | $ 260 |

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