PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,611	$ 5,825	$ 13,222	$ 11,651
Interest cost	6,058	7,371	12,116	14,743
Expected return on plan assets	(16,896)	(14,882)	(33,792)	(29,766)
Amortization of prior service cost	(71)	(70)	(142)	(141)
Amortization of unrecognized actuarial loss	5,750	2,592	11,499	5,184
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 1,452	$ 836	2,903	$ 1,671
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 150,000