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Receivables from and Payables to Brokers, Dealers, and Clearing Agencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Broker Dealer Receivables And Payable [Line Items]
Interest on margin payable	$ 1,456	$ 2,513	$ 828

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- Details

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- Definition

Interest on margin payable.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration