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Segment Information - Sales by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 1,077,814 | $ 957,931 | $ 3,245,671 | $ 2,806,218
Specialty Products & Electronics |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 408,806 | 335,143 | 1,229,753 | 975,006
Transit Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 258,419 | 276,913 | 814,823 | 789,096
Brake Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 222,152 | 177,165 | 655,350 | 550,181
Remanufacturing, Overhaul & Build |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 134,726 | 132,018 | 397,626 | 387,634
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 53,711 | $ 36,692 | $ 148,119 | $ 104,301

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