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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 2,816,443 | $ 2,006,949 | $ 2,260,182
Income from Operations |  |  |  |  |  |  |  |  | 352,063 | 412,837 | 585,368
Interest expense, net |  |  |  |  |  |  |  |  | (68,704) | (42,561) | (16,888)
Income tax expense |  |  |  |  |  |  |  |  | (89,773) | (99,433) | (186,740)
Net income attributable to Wabtec shareholders | $ 48,948 | $ 67,399 | $ 72,025 | $ 73,889 | $ 46,328 | $ 82,428 | $ 90,485 | $ 94,163 | 262,261 | 304,887 | $ 398,628
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 |  |  |  |  |  |  |  |  | (1,496) | (1,652) |
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain) |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 5,037 | 3,989 |
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 |  |  |  |  |  |  |  |  | 3,541 | 2,337 |
Income tax expense |  |  |  |  |  |  |  |  | (979) | (695) |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | 2,562 | 1,642 |
Reclassification out of Accumulated Other Comprehensive Income | Derivative Contracts |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | 400 | 1,873 |
Income tax expense |  |  |  |  |  |  |  |  | (140) | (557) |
Net income attributable to Wabtec shareholders |  |  |  |  |  |  |  |  | $ 260 | $ 1,316 |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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