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Acquisitions - Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Business Combinations [Abstract] |  |
Net sales | $ 2,079,771 | $ 1,881,724
Gross profit | 543,480 | 553,681
Net income attributable to Wabtec shareholders | $ 83,277 | $ 77,275
Diluted earnings per share |  |
As Reported (in dollars per share) | $ (0.04) | $ 0.92
Pro forma (in dollars per share) | $ 0.44 | $ 0.41

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