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Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator
Net (loss) income attributable to Wabtec shareholders	$ (4,472)	$ 88,366
Less: dividends declared - common shares and non-vested restricted stock	(11,687)	(11,531)
Undistributed earnings	$ (16,159)	$ 76,835
Percentage allocated to common shareholders (as a percent)	99.70%	99.70%
Undistributed earnings allocated to common shareholders	$ (16,111)	$ 76,604
Add: dividends declared - common shares	11,646	11,497
Numerator for basic and diluted earnings per common share	$ (4,465)	$ 88,101
Denominator
Basic weighted average common shares outstanding (in shares)	121,226	95,810
Assumed conversion of dilutive stock-based compensation plans (in shares)	0	561
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversion (in shares)	121,226	96,371
Net income attributable to Wabtec shareholders per common share
Basic (in dollars per share)	$ (0.04)	$ 0.92
Diluted (in dollars per share)	$ (0.04)	$ 0.92
Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares)	121,565	96,091

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