PENSION PLANS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 23,664	$ 27,116	$ 25,093
Interest cost	29,019	26,149	25,895
Expected return on plan assets	(59,153)	(58,641)	(53,552)
Prior service cost	(283)	(252)	(100)
Recognized net actuarial loss	9,310	16,867	12,925
Curtailment charge	0	337	327
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	2,557	11,576	10,588
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	432	490	435
Interest cost	796	719	762
Prior service cost	(656)	(656)	(656)
Recognized net actuarial loss	(198)	(131)	(223)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 374	$ 422	$ 318