PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,870	$ 6,611
Interest cost	4,306	6,058
Expected return on plan assets	(15,180)	(16,896)
Amortization of prior service cost	(63)	(71)
Amortization of unrecognized actuarial loss	7,143	5,749
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 3,076	1,451
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 150,000