XML 74 R113.htm IDEA: XBRL DOCUMENT v2.4.0.6
Preferred Stock - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]    
Preferred stock, authorized 2.0 2.0
Preferred stock, par value $ 1.00 $ 1.00