Compensation Programs (Schedule Of Dividend Equivalent Rights) (Detail) (USD $)	12 Months Ended														1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 2008 [Member]	Dec. 31, 2011 2008 [Member]	Dec. 31, 2010 2008 [Member]	Dec. 31, 2012 2009 [Member]	Dec. 31, 2011 2009 [Member]	Dec. 31, 2010 2009 [Member]	Dec. 31, 2012 2010 [Member]	Dec. 31, 2011 2010 [Member]	Dec. 31, 2010 2010 [Member]	Dec. 31, 2012 2011 [Member]	Dec. 31, 2011 2011 [Member]	Jul. 31, 2012 2012 [Member]	Dec. 31, 2012 2012 [Member]
Share Based Compensation Arrangement By Dividend Equivalent Rights [Line Items]
Month of Grant				July 2008			July 2009			July 2010			August 2011			July 2012
Total Grant	654,000			225,000			225,000			60,000			72,000		72,000	72,000
Related compensation costs	$ 914,000	$ 960,000	$ 719,000	$ 335,000	$ 396,000	$ 340,000	$ 335,000	$ 396,000	$ 340,000	$ 89,000	$ 105,000	$ 39,000	$ 107,000	$ 63,000		$ 48,000