PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,826	$ 6,506
Interest cost	7,372	6,534
Expected return on plan assets	(14,884)	(14,716)
Amortization of prior service cost	(71)	(63)
Amortization of unrecognized actuarial loss	2,592	3,906
Net postretirement benefit cost (income)	$ 835	2,167
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 50,000