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Basis Of Presentation - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended
Jul. 22, 2013
Apr. 16, 2013
May 23, 2006
Limits On Use Of Authorized Capital Stock [Line Items]      
Limits on use of authorized common stock shares     40
Limits on use of authorized preferred stock shares     2
Common Stock, Dividends, Per Share, Declared $ 0.15 $ 0.15