PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) - Pension Plans Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,137	$ 6,372	$ 14,273	$ 12,742
Interest cost	7,497	7,552	14,988	15,096
Expected return on plan assets	(13,688)	(10,425)	(27,367)	(20,838)
Amortization of prior service cost	156	157	311	315
Amortization of unrecognized actuarial loss	3,866	1,483	7,731	2,966
Net postretirement benefit cost (income)	$ 4,968	$ 5,139	$ 9,936	$ 10,281