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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 1,111,680 | $ 932,253 | $ 2,167,857 | $ 1,848,287
Income (loss) from operations | 123,523 | 113,357 | 254,802 | 227,869
Interest expense and other, net | (29,749) | (16,628) | (47,447) | (31,675)
Income from operations before income taxes | 93,774 | 96,729 | 207,355 | 196,194
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 412,258 | 344,828 | 791,812 | 692,774
Income from operations before income taxes | 84,347 | 63,165 | 153,969 | 134,387
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 699,422 | 587,425 | 1,376,045 | 1,155,513
Income from operations before income taxes | 57,975 | 59,050 | 126,059 | 108,025
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 430,957 | 354,967 | 822,513 | 712,000
Income (loss) from operations | 84,347 | 63,165 | 153,969 | 134,387
Interest expense and other, net | 0 | 0 | 0 | 0
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 702,406 | 593,498 | 1,382,918 | 1,167,272
Income (loss) from operations | 57,975 | 59,050 | 126,059 | 108,025
Interest expense and other, net | 0 | 0 | 0 | 0
Intersegment sales/(elimination) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (21,683) | (16,212) | (37,574) | (30,985)
Intersegment sales/(elimination) | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 18,699 | 10,139 | 30,701 | 19,226
Intersegment sales/(elimination) | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 2,984 | 6,073 | 6,873 | 11,759
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | (18,799) | (8,858) | (25,226) | (14,543)
Interest expense and other, net | (29,749) | (16,628) | (47,447) | (31,675)
Income from operations before income taxes | $ (48,548) | $ (25,486) | $ (72,673) | $ (46,218)

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