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Fair Value Measurements - Securities Owned and Securities Sold, But Not Yet Purchased at Fair Value (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | $ 707,108,000 | $ 734,831,000
Securities Sold | 85,050,000 | 126,493,000
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 710,668,000 | 735,393,000
U.S. treasury, agency and sovereign obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 459,051,000 | 509,614,000
Securities Sold | 28,674,000 | 77,485,000
Corporate debt and other obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 17,074,000 | 16,138,000
Securities Sold | 2,536,000 | 1,652,000
Mortgage and other asset-backed securities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 5,024,000 | 3,504,000
Securities Sold | 31,000 | 27,000
Municipal obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 56,750,000 | 30,132,000
Securities Sold | 516,000 | 0
Convertible bonds |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 56,480,000 | 54,693,000
Securities Sold | 11,604,000 | 5,951,000
Corporate equities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 31,174,000 | 34,475,000
Securities Sold | 41,689,000 | 41,378,000
Money markets |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 189,000 | 35,000
Securities Sold | 0 | 0
Auction rate securities |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 84,926,000 | 86,802,000
Securities Sold | 0 | 0
Held for Sale Assets |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | $ 3,600,000 | $ 562,000

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- Definition Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned + References No definition available. + Details
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- Definition Fair value of financial instruments held 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=73719730&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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- 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=73719730&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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