PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,874	$ 6,347	$ 18,819	$ 18,832
Interest cost	6,951	7,503	19,406	22,915
Expected return on plan assets	(13,549)	(13,462)	(40,144)	(40,633)
Amortization of prior service cost	(24)	(11)	(75)	(34)
Amortization of unrecognized actuarial loss	2,525	2,837	9,691	9,023
Net postretirement benefit cost (income)	$ 1,777	$ 3,214	$ 7,697	$ 10,103