SEGMENT INFORMATION - Sales by Product (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total sales	$ 832,849	$ 809,527	$ 847,028	$ 818,594	$ 820,866	$ 797,271	$ 731,068	$ 695,249	$ 3,307,998	$ 3,044,454	$ 2,566,392
Specialty Products & Electronics
Segment Reporting Information [Line Items]
Total sales									1,733,881	1,393,955	1,041,771
Brake Products
Segment Reporting Information [Line Items]
Total sales									627,552	662,336	567,730
Remanufacturing, Overhaul & Build
Segment Reporting Information [Line Items]
Total sales									606,624	618,885	655,387
Other Transit Products
Segment Reporting Information [Line Items]
Total sales									189,581	201,913	204,115
Other
Segment Reporting Information [Line Items]
Total sales									$ 150,360	$ 167,365	$ 97,389