PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,931	$ 6,285	$ 20,921	$ 19,507
Interest cost	4,585	5,772	13,402	17,888
Expected return on plan assets	(15,177)	(16,602)	(45,548)	(50,394)
Amortization of prior service cost	(216)	178	(648)	36
Amortization of unrecognized actuarial loss	6,988	5,539	21,705	17,038
Gain (Loss) Due to Settlement	(235)	0	(3,310)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 3,346	$ 1,172	$ 13,142	4,075
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 150,000