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Receivable from and Payable to Brokers, Dealers and Clearing Organizations - Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Receivable from brokers, dealers and clearing organizations consist of:
Securities borrowed	$ 299,037	$ 365,642
Receivable from brokers	44,222	41,091
Securities failed to deliver	33,649	10,031
Clearing organizations	100	399
Omnibus accounts	17,524	28,212
Other	975	34,324
Receivables from broker, dealers and clearing organizations	395,507	479,699
Payable to brokers, dealers and clearing organizations consist of:
Securities loaned	251,751	190,387
Securities failed to receive	12,774	11,315
Clearing organizations and other	1,418	2,516
Payable to brokers, dealers and clearing organizations	$ 265,943	$ 204,218

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Omnibus accounts.

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- Definition

This is the amount of cash advanced as security in return for borrowing securities from another party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 9

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- Definition

The amount of cash received as security in return for loaning securities to another party.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

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-Paragraph 16

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-Section S99

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-Subparagraph (SX 210.9-03.12)

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- Definition

Amount receivable from correspondent broker-dealer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

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Amount of other payables due to broker-dealer.

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Amount of other receivables due from broker-dealer.

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Amount payable to broker-dealers and clearing organizations, including, but not limited to, securities failed-to-receive, certain deposits received for securities loaned, open transactions, and floor-brokerage payables.

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

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Amount of right to receive cash and securities on deposit with clearing organizations. Clearing organizations perform post trade processing and trade comparisons among numerous broker-dealers and act as settlement agents between buying and selling broker-dealers.

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Amount receivable as the result of a fail-to-deliver. A fail-to-deliver is a securities sale to another broker-dealer that has not been delivered to buying broker-dealer by the close of business on the settlement date.

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Amount payable as the result of fail-to-receive. A fail-to-receive is a securities purchase from another broker-dealer not received from the selling broker-dealer by the close of business on the settlement date.

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