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Fair Value Measurements - Securities Owned and Securities Sold, But Not Yet Purchased at Fair Value (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | $ 952,468,000 | $ 735,393,000
Securities Sold | 259,032,000 | 126,493,000
OMHHF |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 562,000 | 562,000
US Treasury and Government [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 616,831,000 | 509,614,000
Securities Sold | 179,562,000 | 77,485,000
Corporate Debt and Other Obligations [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 40,311,000 | 16,138,000
Securities Sold | 23,811,000 | 1,652,000
Mortgage and Other Asset-Backed Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 3,875,000 | 3,504,000
Securities Sold | 27,000 | 27,000
Municipal Bonds [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 106,661,000 | 30,132,000
Securities Sold | 0 | 0
Convertible Bonds [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 56,582,000 | 54,693,000
Securities Sold | 12,505,000 | 5,951,000
Equity Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 38,612,000 | 34,475,000
Securities Sold | 43,127,000 | 41,378,000
Money Markets [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 495,000 | 35,000
Securities Sold | 0 | 0
Auction Rate Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 89,101,000 | 86,802,000
Securities Sold | $ 0 | $ 0

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- Definition Security Owned and Sold, Not yet Purchased Fair Value, Security Owned, Including Disposal Group Securities Owned + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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