PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,285	$ 6,096	$ 19,507	$ 17,747
Interest cost	5,772	7,045	17,888	21,788
Expected return on plan assets	(16,602)	(14,645)	(50,394)	(44,411)
Amortization of prior service cost	178	170	36	29
Amortization of unrecognized actuarial loss	5,539	1,557	17,038	6,741
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total	$ 1,172	$ 223	4,075	$ 1,894
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 150,000