PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10,899	$ 9,978	$ 21,718	$ 20,133
Interest cost	6,781	6,676	13,516	13,131
Expected return on plan assets	(8,875)	(8,356)	(17,761)	(16,770)
Amortization of prior service cost	254	300	554	601
Amortization of unrecognized actuarial loss	3,935	3,015	8,207	5,511
Curtailments	2,711	0	2,711	0
Net postretirement benefit cost (income)	15,705	11,613	28,945	22,606
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	99	110	199	220
Interest cost	209	231	417	463
Amortization of prior service cost	(157)	(157)	(314)	(314)
Amortization of unrecognized actuarial loss	(160)	(179)	(320)	(359)
Net postretirement benefit cost (income)	$ (9)	$ 5	$ (18)	$ 10