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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