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Segment Information - Segment Financial Information (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
Income (loss) from operations | 131,279 | 114,512
Interest expense and other, net | (17,698) | (15,047)
Income from operations before income taxes | 113,581 | 99,465
Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 379,554 | 347,946
Income from operations before income taxes | 69,623 | 71,222
Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 676,623 | 568,088
Income from operations before income taxes | 68,083 | 48,975
Operating Segments | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 391,556 | 357,033
Income (loss) from operations | 69,623 | 71,222
Interest expense and other, net | 0 | 0
Operating Segments | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 680,512 | 573,774
Income (loss) from operations | 68,083 | 48,975
Interest expense and other, net | 0 | 0
Intersegment sales/(elimination) |  |
Segment Reporting Information [Line Items] |  |
Total sales | (15,891) | (14,773)
Intersegment sales/(elimination) | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 12,002 | 9,087
Intersegment sales/(elimination) | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 3,889 | 5,686
Corporate Activities and Elimination |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | (6,427) | (5,685)
Interest expense and other, net | (17,698) | (15,047)
Income from operations before income taxes | $ (24,125) | $ (20,732)

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