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Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Numerator |  |  |  |  |  |
Net income attributable to Wabtec shareholders | $ 104,235 |  | $ 84,416 |  | $ 99,763 | $ 172,782
Less: dividends declared - common shares and non-vested restricted stock | (22,576) | $ (11,687) | (11,565) | $ (11,531) | (34,264) | (23,096)
Undistributed earnings | $ 81,659 |  | $ 72,851 |  | $ 65,499 | $ 149,686
Percentage allocated to common shareholders (as a percent) | 99.70% |  | 99.70% |  | 99.70% | 99.70%
Undistributed earnings allocated to common shareholders | $ 81,414 |  | $ 72,632 |  | $ 65,303 | $ 149,237
Add: dividends declared - common shares | 22,508 |  | 11,531 |  | 34,154 | 23,027
Dividends declared - preferred shares | (422) |  | 0 |  | (422) | 0
Numerator for basic earnings per common share | 103,500 |  | 84,163 |  | 99,035 | 172,264
Dividends declared - preferred shares | 422 |  | 0 |  | 422 | 0
Numerator for diluted earnings per common share | $ 103,922 |  | $ 84,163 |  | $ 99,457 | $ 172,264
Denominator |  |  |  |  |  |
Basic weighted average common shares outstanding (in shares) | 177,348 |  | 95,992 |  | 149,553 | 95,867
Assumed conversion of preferred shares (in shares) | 13,743 |  | 0 |  | 12,213 | 0
Assumed conversion of dilutive stock-based compensation plans (in shares) | 362 |  | 583 |  | 389 | 604
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversion (in shares) | 191,453 |  | 96,575 |  | 162,155 | 96,471
Net income attributable to Wabtec shareholders per common share |  |  |  |  |  |
Basic (in dollars per share) | $ 0.58 |  | $ 0.88 |  | $ 0.66 | $ 1.80
Diluted (in dollars per share) | $ 0.54 |  | $ 0.87 |  | $ 0.61 | $ 1.79
Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares) | 177,922 |  | 96,276 |  | 150,013 | 96,153

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