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Categorization of Investments and Certain Other Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | $ 139,665 |  | $ 182,002 |
Cash and Cash Equivalents | 230,042 |  | 234,568 |
Corporate Bonds, Municipal Bonds and Other Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 31,150 | [1] | 38,482 | [1]
Securities Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 14,761 | [1] | 11,580 |
Mutual Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 8,888 |  | 11,346 |
Financial Instruments Owned and Pledged as Collateral at Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 84,866 |  | 120,594 |
Treasury Bills, Municipal Bonds and Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and Cash Equivalents | 13,756 |  | 24,863 |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 105,152 |  | 141,078 |
Cash and Cash Equivalents | 230,042 |  | 234,568 |
Level 1 [Member] | Securities Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 11,398 | [1] | 9,138 |
Level 1 [Member] | Mutual Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 8,888 |  | 11,346 |
Level 1 [Member] | Financial Instruments Owned and Pledged as Collateral at Fair Value [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 84,866 |  | 120,594 |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 34,513 |  | 40,924 |
Level 2 [Member] | Corporate Bonds, Municipal Bonds and Other Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | 31,150 | [1] | 38,482 | [1]
Level 2 [Member] | Securities Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Assets Measured At Fair Value | $ 3,363 |  | $ 2,442 |
[1] | Includes $13,756 and $24,863 of treasury bills, municipal bonds and commercial paper classified within Cash and Cash Equivalents on the Unaudited Condensed Consolidated Statements of Financial Condition as of September 30, 2013 and December 31, 2012, respectively.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Details
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Data Type: | xbrli:stringItemType
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