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EARNINGS PER SHARE - Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator
Net income attributable to Wabtec shareholders	$ 34,423	$ 87,739	$ 84,416	$ 88,366	$ 48,948	$ 67,399	$ 72,025	$ 73,889	$ 294,944	$ 262,261	$ 304,887
Less: dividends declared - common shares and non-vested restricted stock									(46,277)	(42,218)	(32,430)
Undistributed earnings									$ 248,667	$ 220,043	$ 272,457
Percentage allocated to common shareholders (as a percent)									99.70%	99.70%	99.70%
Undistributed earnings allocated to common shareholders									$ 247,921	$ 219,383	$ 271,640
Add: dividends declared - common shares									46,173	42,092	32,333
Numerator for basic and diluted earnings per common share									$ 294,094	$ 261,475	$ 303,973
Denominator
Denominator for basic earnings per common share - weighted average shares (in shares)									95,994	95,453	90,359
Assumed conversion of dilutive stock-based compensation plans (in shares)									470	672	782
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares)									96,464	96,125	91,141
Net income per common share attributable to Wabtec shareholders
Net income attributable to Wabtec shareholders, basic (in dollars per share)	$ 0.36	$ 0.91	$ 0.88	$ 0.92	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 3.06	$ 2.74	$ 3.37
Net income attributable to Wabtec shareholders (in dollars per share)	$ 0.36	$ 0.91	$ 0.87	$ 0.92	$ 0.51	$ 0.70	$ 0.75	$ 0.77	$ 3.05	$ 2.72	$ 3.34
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares)									96,281	95,740	90,627

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