Annual report pursuant to section 13 and 15(d)

Notes Payable (Notes payable consisted) (Parenthetical) (Detail)

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Notes Payable (Notes payable consisted) (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Notes payable, Unamortized discount $ 7,120 $ 9,113