PENSION PLANS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 25,100	$ 26,873	$ 25,262
Interest cost	30,495	30,050	30,403
Expected return on plan assets	(54,101)	(54,629)	(41,746)
Prior service cost	(46)	618	662
Recognized net actuarial loss	12,029	16,890	6,827
Curtailment charge		7,461	377
Defined Benefit Plan, Net Periodic Benefit Cost	13,477	27,263	21,785
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	338	286	246
Interest cost	996	842	877
Prior service cost	(657)	(657)	(657)
Recognized net actuarial loss	(296)	(551)	(811)
Defined Benefit Plan, Net Periodic Benefit Cost	$ 381	$ (80)	$ (345)