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Notes Payable (Parenthetical) (Detail) (USD $)
In Thousands |
Jun. 30, 2012
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Dec. 31, 2011
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| Debt Instrument [Line Items] | ||
| Notes payable, Unamortized discount | $ 8,116 | $ 9,113 |
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Notes payable to finance Securities America acquisition
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| Debt Instrument [Line Items] | ||
| Notes payable, Unamortized discount | $ 8,116 | $ 9,113 |
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