PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,611	$ 5,826
Interest cost	6,058	7,372
Expected return on plan assets	(16,896)	(14,884)
Amortization of prior service cost	(71)	(71)
Amortization of unrecognized actuarial loss	5,749	2,592
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	1,451	$ 835
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 150,000