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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 | Dec. 31, 2015 | Dec. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | $ 95,182 | $ 145,925
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 | 44,144 | 34,343
Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 6,949 | 7,192
Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 2,347 | 5,702
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 | 41,742 | 98,688
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 | 9,653 | 9,252
Level I [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 49,289 | 109,940
Cash and Cash Equivalents | 439,111 | 342,908
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 | 5,200 | 5,550
Level I [Member] | Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 2,347 | 5,702
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 | 41,742 | 98,688
Level II [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 45,893 | 35,985
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 | 44,144 | 34,343
Level II [Member] | Securities Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Assets Measured At Fair Value | 1,749 | 1,642
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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