Stockholders Equity (Schedule Of Outstanding Preferred Stock) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Stockholders' Equity [Line Items]
Convertible, number of equity instruments	165
$1.60 Cumulative Preferred Stock, Series A [Member]
Stockholders' Equity [Line Items]
Annual Dividend	1.60
Conversion Rate	1.6584	[1]
Recorded Amount	13.98
Liquidation Preference	16.40
Redemption Price	16.40
Convertible, number of equity instruments	100
$1.26 Cumulative Convertible Preferred Stock, Series B [Member]
Stockholders' Equity [Line Items]
Annual Dividend	1.26
Conversion Rate	0.6407	[1]
Recorded Amount	11.30
Liquidation Preference	11.38
Redemption Price	12.50

[1] Reflects the number of common shares to be received for each preferred share converted based on conversion rates in effect January 1, 2013 for the Series A shares and December 31, 2012 for the Series B shares. During 2012, 100 Series A shares were converted into 165 common shares.