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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
Sep. 30, 2016
Dec. 31, 2015
Level I [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents $ 436,362 $ 439,111
Securities Purchased Under Agreements to Resell 0 0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Closely-held Equity Security 0 0
Loans Receivable 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
Subordinated Borrowings 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 12,881 2,191
Accounts Receivable 146,341 175,497
Receivable from Employees and Related Parties 19,325 21,189
Assets Segregated for Bank Regulatory Requirements 0 0
Closely-held Equity Security 0 0
Loans Receivable 3,572 3,666
Accounts Payable and Accrued Expenses 33,017 43,878
Securities Sold Under Agreements to Repurchase 30,757 44,000
Payable to Employees and Related Parties 25,759 28,392
Notes Payable 174,707 120,373
Subordinated Borrowings 17,142 23,076
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 0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Assets Segregated for Bank Regulatory Requirements 0 0
Closely-held Equity Security 1,079 1,079
Loans Receivable 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
Subordinated Borrowings 0 0
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 436,362 439,111
Securities Purchased Under Agreements to Resell 12,881 2,191
Accounts Receivable 146,341 175,497
Receivable from Employees and Related Parties 19,325 21,189
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Closely-held Equity Security 1,079 1,079
Loans Receivable 3,572 3,666
Accounts Payable and Accrued Expenses 33,017 43,878
Securities Sold Under Agreements to Repurchase 30,757 44,000
Payable to Employees and Related Parties 25,759 28,392
Notes Payable 174,707 120,373
Subordinated Borrowings 17,142 23,076
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 436,362 439,111
Securities Purchased Under Agreements to Resell 12,881 2,191
Accounts Receivable 146,341 175,497
Receivable from Employees and Related Parties 19,325 21,189
Assets Segregated for Bank Regulatory Requirements 10,200 10,200
Closely-held Equity Security 1,079 1,079
Loans Receivable 3,500 3,500
Accounts Payable and Accrued Expenses 33,017 43,878
Securities Sold Under Agreements to Repurchase 30,757 44,000
Payable to Employees and Related Parties 25,759 28,392
Notes Payable 168,035 119,250
Subordinated Borrowings $ 16,550 $ 22,550