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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 932,253 | $ 723,601 | $ 1,848,287 | $ 1,495,632
Income (loss) from operations | 113,701 | 133,284 | 228,559 | 275,465
Interest expense and other, net | (16,972) | (6,198) | (32,365) | (10,915)
Income from operations before income taxes | 96,729 | 127,086 | 196,194 | 264,550
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 354,967 | 410,683 | 712,000 | 859,160
Income from operations before income taxes | 63,337 | 92,317 | 134,732 | 198,991
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 593,498 | 330,640 | 1,167,272 | 661,679
Income from operations before income taxes | 59,222 | 52,146 | 108,370 | 97,156
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 344,828 | 397,067 | 692,774 | 839,736
Income (loss) from operations | 63,337 | 92,317 | 134,732 | 198,991
Interest expense and other, net | 0 | 0 | 0 | 0
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 587,425 | 326,534 | 1,155,513 | 655,896
Income (loss) from operations | 59,222 | 52,146 | 108,370 | 97,156
Interest expense and other, net | 0 | 0 | 0 | 0
Intersegment sales/(elimination) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (16,212) | (17,722) | (30,985) | (25,207)
Intersegment sales/(elimination) | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 10,139 | 13,616 | 19,226 | 19,424
Intersegment sales/(elimination) | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 6,073 | 4,106 | 11,759 | 5,783
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (16,212) | (17,722) | (30,985) | (25,207)
Income (loss) from operations | (8,858) | (11,179) | (14,543) | (20,682)
Interest expense and other, net | (16,972) | (6,198) | (32,365) | (10,915)
Income from operations before income taxes | $ (25,830) | $ (17,377) | $ (46,908) | $ (31,597)

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