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Pension And Other Postretirement Benefit Plans (Schedule Of Changes In Level 3 Investments Measured At Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Limited Partnerships [Member]	Dec. 31, 2011 Limited Partnerships [Member]	Dec. 31, 2012 Private Equity Funds [Member]	Dec. 31, 2011 Private Equity Funds [Member]	Dec. 31, 2012 Other Receivables (Payables), net [Member]	Dec. 31, 2011 Other Receivables (Payables), net [Member]	Dec. 31, 2012 Level 3	Dec. 31, 2011 Level 3	Dec. 31, 2010 Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 142,899		$ 1,032	$ 1,012	$ 1,048	$ 2,242	$ 0	$ 15	$ 2,063	$ 2,080	$ 3,269
Relating to assets still held at the reporting date	615	587	626	298	(11)	289	0	0
Relating to assets sold during the period	(632)	(1,776)	0	(278)	(632)	(1,483)	0	(15)
Fair value of plan assets at end of year	$ 165,067	$ 142,899	$ 1,658	$ 1,032	$ 405	$ 1,048	$ 0	$ 0	$ 2,063	$ 2,080	$ 3,269

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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