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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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