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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total sales | $ 2,236,284 | $ 1,111,680 | $ 3,829,901 | $ 2,167,857
Income (loss) from operations | 200,637 | 123,523 | 267,944 | 254,802
Interest expense and other, net | (56,383) | (29,749) | (109,180) | (47,447)
Income from operations before income taxes | 144,254 | 93,774 | 158,764 | 207,355
Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,493,949 | 412,258 | 2,370,383 | 791,812
Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 742,335 | 699,422 | 1,459,518 | 1,376,045
Corporate Activities and Elimination |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | (21,092) | (21,683) | (43,918) | (37,574)
Income (loss) from operations | (22,552) | (18,799) | (89,388) | (25,226)
Interest expense and other, net | (56,383) | (29,749) | (109,180) | (47,447)
Income from operations before income taxes | (78,935) | (48,548) | (198,568) | (72,673)
Corporate Activities and Elimination | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 13,709 | 18,699 | 30,413 | 30,701
Corporate Activities and Elimination | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 7,383 | 2,984 | 13,505 | 6,873
Operating Segments | Freight Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 1,507,658 | 430,957 | 2,400,796 | 822,513
Income (loss) from operations | 151,978 | 84,347 | 227,188 | 153,969
Interest expense and other, net | 0 | 0 | 0 | 0
Income from operations before income taxes | 151,978 | 84,347 | 227,188 | 153,969
Operating Segments | Transit Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total sales | 749,718 | 702,406 | 1,473,023 | 1,382,918
Income (loss) from operations | 71,211 | 57,975 | 130,144 | 126,059
Interest expense and other, net | 0 | 0 | 0 | 0
Income from operations before income taxes | $ 71,211 | $ 57,975 | $ 130,144 | $ 126,059

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