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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) - Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ 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
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,075,538 | $ 957,931 | $ 932,253 | $ 916,034 | $ 759,982 | $ 675,574 | $ 723,601 | $ 772,031 | $ 3,881,756 | $ 2,931,188 | $ 3,307,998
Gross profit | 268,440 | 253,203 | 273,963 | 269,707 | 219,189 | 212,481 | 237,389 | 255,180 | 1,065,313 | 924,239 | 1,047,816
Income from operations | 91,163 | 102,011 | 113,701 | 114,858 | 62,800 | 120,096 | 133,284 | 142,181 | 421,733 | 458,361 | 607,567
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
Basic earnings from operations per common share (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
Diluted earnings from operations per common share (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
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from operations | $ (14,800) |  |  |  |  |  |  |  |  |  |

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