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Acquisitions - Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Combinations [Abstract] |  |  |  |
Net sales | $ 2,236,284 | $ 2,023,848 | $ 4,316,055 | $ 3,905,572
Gross profit | 703,676 | 634,868 | 1,247,156 | 1,019,549
Net income attributable to Wabtec shareholders | $ 171,875 | $ 151,475 | $ 255,152 | $ 99,206
Diluted earnings per share |  |  |  |
As Reported (in dollars per share) | $ 0.54 | $ 0.87 | $ 0.61 | $ 1.79
Pro forma (in dollars per share) | $ 0.90 | $ 0.79 | $ 1.34 | $ 0.52

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