SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 567,901	$ 507,092	$ 1,659,145	$ 1,543,366
Operating income (expense)	96,550	76,573	231,048	201,925
Identifiable assets	3,221,224		3,221,224		$ 3,037,781
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	294,158	276,179	865,070	841,812
Operating income (expense)	46,774	39,067	121,088	108,076
Identifiable assets	1,443,206		1,443,206		1,391,040
Defense [Member]
Segment Reporting Information [Line Items]
Net sales	142,681	114,946	384,917	335,553
Operating income (expense)	33,636	28,822	65,978	64,276
Identifiable assets	1,051,580		1,051,580		751,859
Power [Member]
Segment Reporting Information [Line Items]
Net sales	132,102	117,929	412,667	370,798
Operating income (expense)	19,486	14,130	60,896	44,872
Identifiable assets	502,553		502,553		516,321
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	(3,346)	(5,446)	(16,914)	(15,299)
Identifiable assets	223,885		223,885		$ 378,561
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1,040)	$ (1,962)	$ (3,509)	$ (4,797)