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Segment Information - Sales by Product (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total sales | $ 1,056,177 | $ 916,034
Specialty Products & Electronics |  |
Segment Reporting Information [Line Items] |  |
Total sales | 386,548 | 315,067
Transit Products |  |
Segment Reporting Information [Line Items] |  |
Total sales | 274,265 | 258,419
Brake Products |  |
Segment Reporting Information [Line Items] |  |
Total sales | 215,618 | 180,459
Remanufacturing, Overhaul & Build |  |
Segment Reporting Information [Line Items] |  |
Total sales | 135,713 | 129,058
Other |  |
Segment Reporting Information [Line Items] |  |
Total sales | $ 44,033 | $ 33,031

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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