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Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | $ 40,702 |  | $ 30,924 |
Cash and securities segregated for regulatory and other purposes | 11,498 |  | 11,500 |
Deposits with clearing organizations | 68,919 |  | 35,816 |
Securities owned: |  |  |  |
Securities owned, at fair value | 1,041,590 |  | 924,541 |
Investments | 11,847 | [1] | 46,958 | [1]
Derivative contracts |  |  | 20 |
TBAs | 4,203 |  | 5,791 |
Securities purchased under agreements to resell |  |  | 847,610 |
Total | 1,157,000 |  | 1,876,439 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 102,535 |  | 69,415 |
Investments | 125 |  | 26 |
Derivative contracts | 2,758 |  | 2,421 |
TBAs | 1,219 | [2] | 2,254 | [2]
Securities sold under agreements to repurchase |  | [3] |  |
Total | 106,637 |  | 74,116 |
Other [Member] |  |  |  |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 127 |  | 122 |
U.S. Treasury Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 699,535 |  | 627,870 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 59,445 |  | 27,462 |
U.S. Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 54,720 |  | 54,358 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 1,114 |  | 47 |
Sovereign obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 33 |  | 577 |
Corporate debt and other obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 24,345 |  | 27,188 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 3,370 |  | 3,696 |
Mortgage Backed Securities, Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 2,793 |  | 4,609 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 34 |  | 14 |
Municipal obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 103,656 |  | 54,963 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 933 |  | 485 |
Convertible bonds [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 44,654 |  | 50,157 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 9,847 |  | 8,533 |
Corporate Note Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 42,592 |  | 38,634 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 27,665 |  | 29,056 |
Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 69,262 |  | 66,185 |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents | 40,702 |  | 30,924 |
Cash and securities segregated for regulatory and other purposes | 11,498 |  | 11,500 |
Deposits with clearing organizations | 9,091 |  | 9,095 |
Securities owned: |  |  |  |
Securities owned, at fair value | 786,798 |  | 703,405 |
Investments | 433 | [1] | 1,512 | [1]
Securities purchased under agreements to resell |  |  |  |
Total | 848,522 |  | 756,436 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 79,260 |  | 44,001 |
Investments | 125 |  | 26 |
Derivative contracts | 290 |  | 66 |
Securities sold under agreements to repurchase |  | [3] |  |
Total | 79,675 |  | 44,093 |
Level 1 [Member] | Other [Member] |  |  |  |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 127 |  | 72 |
Level 1 [Member] | U.S. Treasury Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 699,535 |  | 627,870 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 59,445 |  | 27,462 |
Level 1 [Member] | U.S. Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 38,155 |  | 32,663 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 1,073 |  |  |
Level 1 [Member] | Corporate debt and other obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 12,060 |  | 12,538 |
Level 1 [Member] | Corporate Note Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 34,165 |  | 29,150 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 18,615 |  | 16,467 |
Level 1 [Member] | Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 2,883 |  | 1,184 |
Level 2 [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 177,715 |  | 152,557 |
Investments | 36,678 | [1] | 32,964 | [1]
Derivative contracts |  |  | 20 |
TBAs | 4,203 |  | 5,791 |
Securities purchased under agreements to resell |  |  | 847,610 |
Total | 218,596 |  | 1,038,942 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 23,275 |  | 25,364 |
Derivative contracts | 215 |  | 8 |
TBAs | 1,219 |  | 2,254 |
Securities sold under agreements to repurchase |  | [3] |  |
Total | 24,709 |  | 27,626 |
Level 2 [Member] | U.S. Agency Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 16,565 |  | 21,695 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 41 |  | 47 |
Level 2 [Member] | Sovereign obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 33 |  | 577 |
Level 2 [Member] | Corporate debt and other obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 12,285 |  | 14,650 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 3,370 |  | 3,696 |
Level 2 [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 2,767 |  | 4,593 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 34 |  | 14 |
Level 2 [Member] | Municipal obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 92,984 |  | 51,401 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 933 |  | 485 |
Level 2 [Member] | Convertible bonds [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 44,654 |  | 50,157 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 9,847 |  | 8,533 |
Level 2 [Member] | Corporate Note Securities [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 8,427 |  | 9,484 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value | 9,050 |  | 12,589 |
Level 3 [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 77,077 |  | 68,579 |
Investments | 12,805 | [1] | 12,482 | [1]
Securities purchased under agreements to resell |  |  |  |
Total | 89,882 |  | 81,061 |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value |  |  | 50 |
Derivative contracts | 2,253 |  | 2,347 |
Securities sold under agreements to repurchase |  | [3] |  |
Total | 2,253 |  | 2,397 |
Level 3 [Member] | Other [Member] |  |  |  |
Securities sold, not yet purchased: |  |  |  |
Securities sold, not yet purchased at fair value |  |  | 50 |
Level 3 [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 26 |  | 16 |
Level 3 [Member] | Municipal obligations [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | 10,672 |  | 3,562 |
Level 3 [Member] | Other [Member] |  |  |  |
Securities owned: |  |  |  |
Securities owned, at fair value | $ 66,379 |  | $ 65,001 |
[1] | Included in other assets on the condensed consolidated balance sheet.
[2] | TBAs are used to offset exposures related to commitments to provide funding for FHA loans at OMHHF. At September 30, 2012, the loan commitments balance was $297.5 million ($326.7 million at December 31, 2011). In addition, at September 30, 2012, OMHHF had a loan receivable balance (included in other assets) of $56.3 million ($109.3 million at December 31, 2011) which relates to prior loan commitments that have been funded but have not yet been securitized. The "when issued" securitizations of these loans have been sold to market counter-parties.
[3] | Includes securities sold under agreements to repurchase agreements where the Company has elected fair value option treatment.

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 4 -IssueDate 2006-05-01 -Chapter 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents securities sold but not yet purchased, that is, sold short, which leads to a liability for the obligation to purchase said securities at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6957929&loc=d3e63862-112815 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 38, 39 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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