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Segment Information - Segment Financial Information (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
Income (loss) from operations | 125,179 | 101,666 | 379,981 | 329,535
Interest expense and other, net | (22,512) | (20,481) | (69,959) | (52,156)
Income from operations before income taxes | 102,667 | 81,185 | 310,022 | 277,379
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 391,577 | 340,185 | 1,183,389 | 1,032,959
Income from operations before income taxes | 79,420 | 61,424 | 233,390 | 195,811
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 686,237 | 617,746 | 2,062,282 | 1,773,259
Income from operations before income taxes | 60,735 | 47,358 | 186,794 | 155,383
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 405,087 | 348,561 | 1,227,600 | 1,060,561
Income (loss) from operations | 79,420 | 61,424 | 233,390 | 195,811
Interest expense and other, net | 0 | 0 | 0 | 0
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 690,975 | 622,240 | 2,073,893 | 1,789,512
Income (loss) from operations | 60,735 | 47,358 | 186,794 | 155,383
Interest expense and other, net | 0 | 0 | 0 | 0
Intersegment sales/(elimination) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (18,248) | (12,870) | (55,822) | (43,855)
Intersegment sales/(elimination) | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 13,510 | 8,376 | 44,211 | 27,602
Intersegment sales/(elimination) | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 4,738 | 4,494 | 11,611 | 16,253
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | (14,976) | (7,116) | (40,203) | (21,659)
Interest expense and other, net | (22,512) | (20,481) | (69,959) | (52,156)
Income from operations before income taxes | $ (37,488) | $ (27,597) | $ (110,162) | $ (73,815)

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