PENSION PLANS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26,013	$ 23,664	$ 27,116
Interest cost	23,847	29,019	26,149
Expected return on plan assets	(67,217)	(59,153)	(58,641)
Prior service cost	(269)	(283)	(252)
Defined Benefit Plan, Amortization of Loss (Gain)	23,062	9,310	16,867
Cost of Settlement/Curtailment	2,395	0	337
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	7,831	2,557	11,576
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	506	432	490
Interest cost	609	796	719
Prior service cost	(657)	(656)	(656)
Defined Benefit Plan, Amortization of Loss (Gain)	(5)	(198)	(131)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 453	$ 374	$ 422