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Pro Forma Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Business Acquisition [Line Items]
Net sales	$ 620,325	$ 632,366
Gross profit	184,523	185,855
Net income attributable to Wabtec shareholders	$ 70,513	$ 64,779
Net income attributable to Wabtec shareholders	$ 1.44	$ 1.22
Diluted earnings per share, Pro forma	$ 1.46	$ 1.34

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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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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