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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
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value $ 93,993 $ 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 44,313 44,144
Securities Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 5,769 6,949
investment Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 26,063 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 17,848 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 9,667 9,653
Level I [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 47,907 49,289
Cash and Cash Equivalents 436,362 439,111
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 3,996 5,200
Level I [Member] | investment Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 26,063 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 17,848 41,742
Level II [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets Measured At Fair Value 46,086 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 44,313 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 1,773 1,749
Level II [Member] | investment Funds [Member]    
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] | investment Funds [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] | 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