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SEGMENT INFROMATION - Segment Financial Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 1,117,876 | $ 1,077,814 | $ 1,111,680 | $ 1,056,177 | $ 1,075,538 | $ 957,931 | $ 932,253 | $ 916,034 | $ 4,363,547 | $ 3,881,756 | $ 2,931,188
Income (loss) from operations | 93,456 | $ 125,179 | $ 123,523 | $ 131,279 | 91,545 | $ 101,666 | $ 113,356 | $ 114,512 | 473,437 | 421,079 | 456,607
Interest expense and other, net |  |  |  |  |  |  |  |  | (105,855) | (69,016) | (43,770)
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 367,582 | 352,063 | 412,837
Depreciation and amortization |  |  |  |  |  |  |  |  | 109,297 | 103,248 | 69,795
Capital expenditures |  |  |  |  |  |  |  |  | 93,305 | 89,466 | 50,216
Segment assets | 8,649,234 |  |  |  | 6,579,980 |  |  |  | 8,649,234 | 6,579,980 | 6,581,018
Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,564,297 | 1,396,588 | 1,543,098
Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,799,250 | 2,485,168 | 1,388,090
Operating Segments | Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,618,525 | 1,434,218 | 1,582,617
Income (loss) from operations |  |  |  |  |  |  |  |  | 304,832 | 264,276 | 343,578
Interest expense and other, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 304,832 | 264,276 | 343,578
Depreciation and amortization |  |  |  |  |  |  |  |  | 39,979 | 43,721 | 36,519
Capital expenditures |  |  |  |  |  |  |  |  | 26,568 | 33,921 | 22,726
Segment assets | 3,774,689 |  |  |  | 3,504,289 |  |  |  | 3,774,689 | 3,504,289 | 2,949,668
Operating Segments | Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,816,833 | 2,506,716 | 1,397,483
Income (loss) from operations |  |  |  |  |  |  |  |  | 227,939 | 188,219 | 170,569
Interest expense and other, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | 227,939 | 188,219 | 170,569
Depreciation and amortization |  |  |  |  |  |  |  |  | 64,287 | 57,441 | 31,545
Capital expenditures |  |  |  |  |  |  |  |  | 59,603 | 50,762 | 20,987
Segment assets | 9,087,026 |  |  |  | 7,562,122 |  |  |  | 9,087,026 | 7,562,122 | 6,720,302
Corporate Activities and Elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (71,811) | (59,178) | (48,912)
Income (loss) from operations |  |  |  |  |  |  |  |  | (59,334) | (31,416) | (57,540)
Interest expense and other, net |  |  |  |  |  |  |  |  | (105,855) | (69,016) | (43,770)
Income (loss) from operations before income taxes |  |  |  |  |  |  |  |  | (165,189) | (100,432) | (101,310)
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,031 | 2,086 | 1,731
Capital expenditures |  |  |  |  |  |  |  |  | 7,134 | 4,783 | 6,503
Segment assets | $ (4,212,481) |  |  |  | $ (4,486,431) |  |  |  | (4,212,481) | (4,486,431) | (3,088,952)
Corporate Activities and Elimination | Freight Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 54,228 | 37,630 | 39,519
Corporate Activities and Elimination | Transit Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 17,583 | $ 21,548 | $ 9,393

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