PENSION PLANS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 27,116	$ 25,093	$ 25,100
Interest cost	26,149	25,895	30,495
Expected return on plan assets	(58,641)	(53,552)	(54,101)
Prior service cost	(252)	(100)	(46)
Recognized net actuarial loss	16,867	12,925	12,029
Curtailment charge	337	327	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11,576	10,588	13,477
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	490	435	338
Interest cost	719	762	996
Prior service cost	(656)	(656)	(657)
Recognized net actuarial loss	(131)	(223)	(296)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 422	$ 318	$ 381