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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator        
Net income attributable to Wabtec shareholders $ 67,399 $ 82,428 $ 213,313 $ 267,076
Less: dividends declared - common shares and non-vested restricted stock (11,518) (8,958) (30,693) (23,523)
Undistributed earnings $ 55,881 $ 73,470 $ 182,620 $ 243,553
Percentage allocated to common shareholders (as a percent) 99.70% 99.70% 99.40% 99.70%
Undistributed earnings allocated to common shareholders $ 55,713 $ 73,250 $ 181,524 $ 242,822
Add: dividends declared - common shares 11,485 8,933 30,508 23,452
Numerator for basic and diluted earnings per common share $ 67,198 $ 82,183 $ 212,032 $ 266,274
Denominator        
Basic weighted average common shares outstanding (in shares) 95,709 89,589 95,163 90,546
Assumed conversion of dilutive stock-based compensation plans (in shares) 607 704 645 770
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversion (in shares) 96,316 90,293 95,808 91,316
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 0.70 $ 0.92 $ 2.23 $ 2.94
Diluted (in dollars per share) $ 0.70 $ 0.91 $ 2.22 $ 2.92
Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares) 95,983 89,838 95,740 90,819