PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,825	$ 6,495	$ 11,651	$ 13,001
Interest cost	7,371	6,521	14,743	13,055
Expected return on plan assets	(14,882)	(14,695)	(29,766)	(29,411)
Amortization of prior service cost	(70)	(62)	(141)	(125)
Amortization of unrecognized actuarial loss	2,592	3,903	5,184	7,809
Net postretirement benefit cost (income)	$ 836	$ 2,162	$ 1,671	4,329
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 50,000