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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Total sales | $ 916,034 | $ 772,031
Income (loss) from operations | 114,858 | 142,181
Interest expense and other, net | (15,393) | (4,717)
Income from operations before income taxes | 99,465 | 137,464
Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 357,033 | 448,477
Income from operations before income taxes | 71,395 | 106,675
Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 573,774 | 331,039
Income from operations before income taxes | 49,148 | 45,010
Operating Segments | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 347,946 | 442,669
Income (loss) from operations | 71,395 | 106,675
Interest expense and other, net | 0 | 0
Operating Segments | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 568,088 | 329,362
Income (loss) from operations | 49,148 | 45,010
Interest expense and other, net | 0 | 0
Intersegment sales/(elimination) |  |
Segment Reporting Information [Line Items] |  |
Total sales | (14,773) | (7,485)
Intersegment sales/(elimination) | Freight Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 9,087 | 5,808
Intersegment sales/(elimination) | Transit Segment |  |
Segment Reporting Information [Line Items] |  |
Total sales | 5,686 | 1,677
Corporate Activities and Elimination |  |
Segment Reporting Information [Line Items] |  |
Total sales | (14,773) | (7,485)
Income (loss) from operations | (5,685) | (9,504)
Interest expense and other, net | (15,393) | (4,717)
Income from operations before income taxes | $ (21,078) | $ (14,221)

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