Compensation Programs (Schedule Of Dividend Equivalent Rights) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Total Grant	654,000
Related compensation costs	$ 203,000		$ 251,000
2008 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2008	[1]
Total Grant	225,000
Related compensation costs	70,000		97,000
2009 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2009	[1]
Total Grant	225,000
Related compensation costs	70,000		97,000
2010 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2010	[1]
Total Grant	60,000
Related compensation costs	19,000		26,000
2011 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	August 2011	[1]
Total Grant	72,000
Related compensation costs	22,000		31,000
2012 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant	July 2012	[1]
Total Grant	72,000
Related compensation costs	$ 22,000

[1] All grants expire July 1, 2015 unless extended by the Committee.