SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 571,614	$ 614,880	$ 1,722,892	$ 1,832,190
Operating income (expense)	84,573	105,569	212,368	283,299
Identifiable assets	3,959,780		3,959,780		$ 3,764,261
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	222,734	279,064	701,048	842,373
Operating income (expense)	24,838	43,641	74,191	130,222
Identifiable assets	1,391,570		1,391,570		1,363,592
Defense [Member]
Segment Reporting Information [Line Items]
Net sales	180,355	160,445	516,531	452,983
Operating income (expense)	41,550	40,241	98,126	93,580
Identifiable assets	1,242,648		1,242,648		1,209,706
Power [Member]
Segment Reporting Information [Line Items]
Net sales	168,976	176,162	506,664	539,616
Operating income (expense)	25,962	28,776	67,843	86,140
Identifiable assets	875,745		875,745		885,727
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	(7,777)	(7,089)	(27,792)	(26,643)
Identifiable assets	449,817		449,817		$ 305,236
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (451)	$ (791)	$ (1,351)	$ (2,782)