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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

X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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