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ACQUISITIONS - Narrative (Detail) $ in Thousands					3 Months Ended	12 Months Ended
	Mar. 21, 2017 USD ($)	Mar. 06, 2017 USD ($)	Feb. 03, 2017 USD ($)	Nov. 30, 2016 USD ($) employee country	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 22, 2018 USD ($)	Dec. 04, 2017 USD ($)	Oct. 02, 2017 USD ($)	Apr. 05, 2017 USD ($)	Mar. 13, 2017 USD ($)	Nov. 30, 2016 € / shares
Business Acquisition [Line Items]
Stock and cash paid						$ 58,850	$ 1,006,207	$ 904,695
Stock used for acquisition						0	25,500	534,679
Non-controlling interests associated with Faiveley Transport Acquisition								$ 760,599
Goodwill						2,396,544	2,460,103
Faiveley
Business Acquisition [Line Items]
Annual sales of Faiveley				$ 1,200,000
Number of employees (more than) | employee				5,700
Number of countries Faiveley operates in | country				24
Purchase price per share (in euros per share) | € / shares														€ 100
Percentage of share capital acquired (as a percent)				51.00%
Percentage of voting interests in Faiveley (as a percent)		22.00%	27.00%	49.00%
Number of common shares issued for conversion of one acquiree common share				1.1538
Percentage of additional share capital outstanding (as a percent)		21.00%	27.00%
Stock and cash paid	$ 17,500	$ 303,200	$ 411,800
Stock used for acquisition		$ 300	$ 25,200
Percentage of share capital owned (as a percent)	100.00%	99.00%	78.00%
Total purchase price (as a percent)	100.00%	98.00%	76.00%	100.00%
Business combination, consideration transferred				$ 1,507,000
Deposit in escrow							$ 744,700
Non-controlling interests associated with Faiveley Transport Acquisition					$ 8,900
Adjustment for changes in receivables				439,631
Adjustment for changes in liabilities				819,493
Goodwill				$ 1,262,350
Faiveley | Minimum
Business Acquisition [Line Items]
Percentage of business acquisition consideration payable in cash (as a percent)				25.00%
Faiveley | Maximum
Business Acquisition [Line Items]
Percentage of business acquisition consideration payable in cash (as a percent)				45.00%
Melett
Business Acquisition [Line Items]
Goodwill										$ 26,653
Purchase price										71,893
Goodwill expected to be deductible for taxes										0
Acquired intangible assets										$ 28,590
TTC
Business Acquisition [Line Items]
Goodwill												$ 14,095
Purchase price												32,511
Goodwill expected to be deductible for taxes												14,100
Acquired intangible assets												$ 12,300
ATP
Business Acquisition [Line Items]
Goodwill													$ 29,034
Purchase price													65,254
Goodwill expected to be deductible for taxes													29,000
Acquired intangible assets													$ 25,000
Annax
Business Acquisition [Line Items]
Goodwill									$ 25,471
Purchase price									28,664
Goodwill expected to be deductible for taxes									0
Acquired intangible assets									$ 12,828
AM General
Business Acquisition [Line Items]
Goodwill											$ 6,114
Purchase price											10,416
Goodwill expected to be deductible for taxes											0
Acquired intangible assets											$ 19,427
Acquisitions other than Faiveley
Business Acquisition [Line Items]
Deposit in escrow						24,400
Recent Acquisitions
Business Acquisition [Line Items]
Goodwill						101,400
Goodwill and other intangible assets						199,500
Acquired intangible assets						98,100
Recent Acquisitions | Trade names
Business Acquisition [Line Items]
Acquired intangible assets						$ 22,300
Recent Acquisitions | Intellectual Property
Business Acquisition [Line Items]
Average useful life, years						20 years
Recent Acquisitions | Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets						$ 70,200
Average useful life, years						20 years

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