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Retirement And Other Postretirement Benefit Plans (Net Periodic Postretirement Benefit Cost) (Detail) (Postretirement Benefit [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Postretirement Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 9	$ 15	$ 33	$ 44
Amortization of unrecognized loss	(3)	3	3	5
Net periodic pension benefit cost	$ 6	$ 18	$ 36	$ 49

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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