Pension And Other Postretirement Benefit Plans (Components Of Net Periodic 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
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,258	$ 1,498	$ 2,516	$ 3,027
Interest cost	10,234	8,878	20,467	18,289
Expected return on plan assets	(15,713)	(12,728)	(31,427)	(25,941)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	30	13	60	7
Amortization of net loss (gain)	1,257	3,723	2,514	6,887
Net periodic cost	(2,934)	1,384	(5,870)	2,269
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	18	42	45
Interest cost	91	62	193	186
Expected return on plan assets	0	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(56)	(59)	(115)	(118)
Amortization of net loss (gain)	(67)	12	(100)	(23)
Net periodic cost	$ (7)	$ 33	$ 20	$ 90