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Fair Value Measurements Carrying Amount and Estimated Fair Value of Financial Instrument Assets and Liabilities which are Not Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents $ 180,423 $ 284,199
Securities Purchased Under Agreements to Resell   19,134
Accounts Receivable 100,325 83,347
Receivable from Employees and Related Parties 9,455 9,233
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Accounts Payable and Accrued Expenses 36,156 18,365
Securities Sold Under Agreements to Repurchase 76,874 75,563
Payable to Employees and Related Parties 17,548 19,524
Notes Payable 104,207 103,226
Level I [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 180,423 284,199
Securities Purchased Under Agreements to Resell   0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Accounts Payable and Accrued Expenses 0 0
Securities Sold Under Agreements to Repurchase 0 0
Payable to Employees and Related Parties 0 0
Notes Payable 0 0
Level II [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 0 0
Securities Purchased Under Agreements to Resell   19,134
Accounts Receivable 100,325 83,347
Receivable from Employees and Related Parties 9,455 9,233
Assets Segregated for Bank Regulatory Requirements 0 0
Accounts Payable and Accrued Expenses 36,156 18,365
Securities Sold Under Agreements to Repurchase 76,874 75,563
Payable to Employees and Related Parties 17,548 19,524
Notes Payable 131,257 127,425
Level III [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 0 0
Securities Purchased Under Agreements to Resell   0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Assets Segregated for Bank Regulatory Requirements 0 0
Accounts Payable and Accrued Expenses 0 0
Securities Sold Under Agreements to Repurchase 0 0
Payable to Employees and Related Parties 0 0
Notes Payable 0 0
Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 180,423 284,199
Securities Purchased Under Agreements to Resell   19,134
Accounts Receivable 100,325 83,347
Receivable from Employees and Related Parties 9,455 9,233
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Accounts Payable and Accrued Expenses 36,156 18,365
Securities Sold Under Agreements to Repurchase 76,874 75,563
Payable to Employees and Related Parties 17,548 19,524
Notes Payable $ 131,257 $ 127,425