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SEGMENT INFORMATION - Sales by Product (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
Revenue from External Customer [Line Items]
Total 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
Specialty Products & Electronics
Revenue from External Customer [Line Items]
Total sales									1,631,966	1,350,727	1,374,580
Brake Products
Revenue from External Customer [Line Items]
Total sales									885,464	749,959	588,081
Remanufacturing, Overhaul & Build
Revenue from External Customer [Line Items]
Total sales									537,122	522,275	559,284
Transit Products
Revenue from External Customer [Line Items]
Total sales									1,111,549	1,112,340	276,124
Other
Revenue from External Customer [Line Items]
Total sales									$ 197,446	$ 146,455	$ 133,119

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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