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Receivable from and Payable to Brokers and Clearing Organizations - Receivable from and Payable to Brokers and Clearing Organizations (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Receivable from brokers and clearing organizations consist of:
Deposits paid for securities borrowed	$ 191,214	$ 365,642
Receivable from brokers	35,844	41,091
Securities failed to deliver	39,223	10,031
Clearing organizations	209	399
Omnibus accounts	16,778	28,212
Other	2,565	34,324
Receivables from broker and clearing organizations	285,833	479,699
Payable to brokers and clearing organizations consist of:
Deposits received for securities loaned	234,880	190,387
Securities failed to receive	15,496	11,315
Clearing organizations and other	4,343	2,516
Payable to brokers and clearing organizations	$ 254,719	$ 204,218

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- Definition

Omnibus accounts.

+ References

No definition available.

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X

- 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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

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- Definition

Amount receivable from correspondent broker-dealer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



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-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-URI http://asc.fasb.org/section&trid=2176260

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- Definition

Amount of other payables due to broker-dealer.

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Amount of other receivables due from broker-dealer.

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- Definition

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.

+ References

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

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-Topic 940

-SubTopic 20

-Section 45

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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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-Topic 310

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- Definition

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.

+ References

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-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



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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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-Publisher FASB

-Name Accounting Standards Codification

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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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-Name Accounting Standards Codification

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