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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 (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Level I [Member]    
Financial Assets:    
Cash and Cash Equivalents $ 395,323 $ 596,141
Certificates of Deposit 0 0
Debt Security Investment 0 0
Securities Purchased Under Agreements to Resell 0 0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Closely-held Equity Security 0 0
Financial Liabilities:    
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
Level II [Member]    
Financial Assets:    
Cash and Cash Equivalents 0 0
Certificates of Deposit 100,000 63,527
Debt Security Investment 0 0
Securities Purchased Under Agreements to Resell 3,616 10,645
Accounts Receivable 232,256 184,993
Receivable from Employees and Related Parties 23,872 17,030
Closely-held Equity Security 0 0
Financial Liabilities:    
Accounts Payable and Accrued Expenses 41,669 34,111
Securities Sold Under Agreements to Repurchase 26,130 30,027
Payable to Employees and Related Parties 34,167 31,167
Notes Payable 163,476 171,929
Subordinated Borrowings   6,859
Level III [Member]    
Financial Assets:    
Cash and Cash Equivalents 0 0
Certificates of Deposit 0 0
Debt Security Investment 9,305 10,995
Securities Purchased Under Agreements to Resell 0 0
Accounts Receivable 0 0
Receivable from Employees and Related Parties 0 0
Closely-held Equity Security 1,079 1,079
Financial Liabilities:    
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
Carrying Amount [Member]    
Financial Assets:    
Cash and Cash Equivalents 395,323 596,141
Certificates of Deposit 100,000 63,527
Debt Security Investment 9,305 10,995
Securities Purchased Under Agreements to Resell 3,616 10,645
Accounts Receivable 232,256 184,993
Receivable from Employees and Related Parties 23,872 17,030
Closely-held Equity Security 1,079 1,079
Financial Liabilities:    
Accounts Payable and Accrued Expenses 41,669 34,111
Securities Sold Under Agreements to Repurchase 26,130 30,027
Payable to Employees and Related Parties 34,167 31,167
Notes Payable 168,543 168,347
Subordinated Borrowings   6,799
Total [Member]    
Financial Assets:    
Cash and Cash Equivalents 395,323 596,141
Certificates of Deposit 100,000 63,527
Debt Security Investment 9,305 10,995
Securities Purchased Under Agreements to Resell 3,616 10,645
Accounts Receivable 232,256 184,993
Receivable from Employees and Related Parties 23,872 17,030
Closely-held Equity Security 1,079 1,079
Financial Liabilities:    
Accounts Payable and Accrued Expenses 41,669 34,111
Securities Sold Under Agreements to Repurchase 26,130 30,027
Payable to Employees and Related Parties 34,167 31,167
Notes Payable $ 163,476 171,929
Subordinated Borrowings   $ 6,859