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Segment Information - Segment Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total sales	$ 1,056,177	$ 916,034
Income (loss) from operations	131,279	114,512
Interest expense and other, net	(17,698)	(15,047)
Income from operations before income taxes	113,581	99,465
Freight Segment
Segment Reporting Information [Line Items]
Total sales	379,554	347,946
Income from operations before income taxes	69,623	71,222
Transit Segment
Segment Reporting Information [Line Items]
Total sales	676,623	568,088
Income from operations before income taxes	68,083	48,975
Operating Segments | Freight Segment
Segment Reporting Information [Line Items]
Total sales	391,556	357,033
Income (loss) from operations	69,623	71,222
Interest expense and other, net	0	0
Operating Segments | Transit Segment
Segment Reporting Information [Line Items]
Total sales	680,512	573,774
Income (loss) from operations	68,083	48,975
Interest expense and other, net	0	0
Intersegment sales/(elimination)
Segment Reporting Information [Line Items]
Total sales	(15,891)	(14,773)
Intersegment sales/(elimination) | Freight Segment
Segment Reporting Information [Line Items]
Total sales	12,002	9,087
Intersegment sales/(elimination) | Transit Segment
Segment Reporting Information [Line Items]
Total sales	3,889	5,686
Corporate Activities and Elimination
Segment Reporting Information [Line Items]
Income (loss) from operations	(6,427)	(5,685)
Interest expense and other, net	(17,698)	(15,047)
Income from operations before income taxes	$ (24,125)	$ (20,732)

X

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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-Name Accounting Standards Codification
-Topic 225
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