PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,120	$ 6,611	$ 13,990	$ 13,222
Interest cost	4,511	6,058	8,817	12,116
Expected return on plan assets	(15,191)	(16,896)	(30,371)	(33,792)
Amortization of prior service cost	(369)	(71)	(432)	(142)
Amortization of unrecognized actuarial loss	7,574	5,750	14,717	11,499
Gain (Loss) Due to Settlement	(3,075)	0	(3,075)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 6,720	$ 1,452	$ 9,796	2,903
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 150,000