SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 614,880	$ 595,393	$ 1,832,190	$ 1,763,213
Operating income (expense)	105,569	97,047	283,299	263,621
Identifiable assets	3,482,309		3,482,309		$ 3,255,385
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	304,914	295,448	917,236	904,806
Operating income (expense)	48,086	44,786	143,768	135,747
Identifiable assets	1,462,833		1,462,833		1,398,601
Defense [Member]
Segment Reporting Information [Line Items]
Net sales	150,098	138,433	417,166	407,401
Operating income (expense)	38,210	33,615	85,524	91,984
Identifiable assets	1,080,148		1,080,148		961,298
Power [Member]
Segment Reporting Information [Line Items]
Net sales	160,943	162,176	501,672	456,383
Operating income (expense)	26,362	28,249	80,650	62,792
Identifiable assets	765,630		765,630		720,073
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	(7,089)	(9,603)	(26,643)	(26,902)
Identifiable assets	173,698		173,698		$ 175,413
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1,075)	$ (664)	$ (3,884)	$ (5,377)