SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 638,996	$ 620,298	$ 1,217,310	$ 1,167,820
Operating income (expense)	105,685	102,076	177,730	166,574
Identifiable assets	3,426,640		3,426,640		$ 3,255,385
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	318,572	312,605	612,322	609,358
Operating income (expense)	56,236	51,736	95,682	90,961
Identifiable assets	1,467,700		1,467,700		1,398,601
Defense [Member]
Segment Reporting Information [Line Items]
Net sales	145,571	148,085	267,068	268,968
Operating income (expense)	29,661	38,641	47,314	58,369
Identifiable assets	1,068,806		1,068,806		961,298
Power [Member]
Segment Reporting Information [Line Items]
Net sales	176,582	162,049	340,729	294,207
Operating income (expense)	30,069	19,201	54,288	34,543
Identifiable assets	771,379		771,379		720,073
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	(10,281)	(7,502)	(19,554)	(17,299)
Identifiable assets	118,755		118,755		$ 175,413
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1,729)	$ (2,441)	$ (2,809)	$ (4,713)