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Stockholder's Equity Preferred Stock (Detail) (Preferred Stock [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dividend 1 [Member]
 
Class of Stock [Line Items]  
Declaration Date Sep. 13, 2012
Record date Sep. 28, 2012
Payment date Oct. 15, 2012
Dividend Amount $ 0.4432
Dividend 2 [Member]
 
Class of Stock [Line Items]  
Declaration Date Dec. 13, 2012
Record date Dec. 31, 2012
Payment date Jan. 15, 2013
Dividend Amount $ 0.5391