BENEFIT PLANS Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	$ 0
Pension Plans, Defined Benefit
Service cost	3,549	3,662	7,101	7,385
Interest cost	2,861	2,445	5,726	4,922
Expected return on plan assets	(1,391)	(1,230)	(2,777)	(2,477)
Amortization of prior service cost	(35)	(33)	(69)	(67)
Amortization of net loss	709	1,269	1,417	2,549
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments		(235)	0	(625)
Defined Benefit Plan, Net Periodic Benefit Cost	5,693	5,878	11,398	11,687
Other Postretirement Benefit Plans, Defined Benefit
Service cost	44	61	89	123
Interest cost	140	122	280	243
Amortization of net loss	12	88	22	176
Defined Benefit Plan, Net Periodic Benefit Cost	$ 196	$ 271	$ 391	$ 542