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Fair Value Measurements Categorization of Investments and Certain Other Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | $ 87,064 | $ 95,182
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 | 44,600 | 44,144
Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 6,877 | 6,949
Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 2,339 | 2,347
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 | 33,248 | 41,742
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 | 6,951 | 9,653
Level I [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 40,708 | 49,289
Cash and Cash Equivalents | 284,572 | 439,111
Level I [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 | 0 | 0
Level I [Member] | Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 5,121 | 5,200
Level I [Member] | Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 2,339 | 2,347
Level I [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 | 33,248 | 41,742
Level II [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 46,356 | 45,893
Cash and Cash Equivalents | 0 | 0
Level II [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 | 44,600 | 44,144
Level II [Member] | Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 1,756 | 1,749
Level II [Member] | Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 0 | 0
Level II [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 | 0 | 0
Level III [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 0 | 0
Cash and Cash Equivalents | 0 | 0
Level III [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 | 0 | 0
Level III [Member] | Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 0 | 0
Level III [Member] | Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 0 | 0
Level III [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 | $ 0 | $ 0

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