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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Wabtec shareholders | $ 48,948 | $ 67,399 | $ 72,025 | $ 73,889 | $ 46,328 | $ 82,428 | $ 90,485 | $ 94,163 | $ 262,261 | $ 304,887 | $ 398,628
Less: dividends declared - common shares and non-vested restricted stock |  |  |  |  |  |  |  |  | (42,218) | (32,430) | (26,963)
Undistributed earnings |  |  |  |  |  |  |  |  | $ 220,043 | $ 272,457 | $ 371,665
Percentage allocated to common shareholders (as a percent) |  |  |  |  |  |  |  |  | 99.70% | 99.70% | 99.70%
Undistributed earnings allocated to common shareholders |  |  |  |  |  |  |  |  | $ 219,383 | $ 271,640 | $ 370,550
Add: dividends declared - common shares |  |  |  |  |  |  |  |  | 42,092 | 32,333 | 26,875
Numerator for basic and diluted earnings per common share |  |  |  |  |  |  |  |  | $ 261,475 | $ 303,973 | $ 397,425
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per common share - weighted average shares (in shares) |  |  |  |  |  |  |  |  | 95,453 | 90,359 | 96,074
Assumed conversion of dilutive stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  | 672 | 782 | 932
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares) |  |  |  |  |  |  |  |  | 96,125 | 91,141 | 97,006
Net income per common share attributable to Wabtec shareholders |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Wabtec shareholders, basic (in dollars per share) | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 0.42 | $ 0.92 | $ 1.00 | $ 1.03 | $ 2.74 | $ 3.37 | $ 4.14
Net income attributable to Wabtec shareholders (in dollars per share) | $ 0.51 | $ 0.70 | $ 0.75 | $ 0.77 | $ 0.42 | $ 0.91 | $ 1.00 | $ 1.02 | $ 2.72 | $ 3.34 | $ 4.10
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares) |  |  |  |  |  |  |  |  | 95,740 | 90,627 | 96,388

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