Broker-Dealers and Clearing Organizations, Other Receivables and Prepaid Expenses and Other Current Liabilities - Additional Information (Detail) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
---|---|---|
Brokers And Dealers [Line Items] | ||
Receivables from Brokers-Dealers and Clearing Organizations | $ 2,858 | $ 3,357 |
Broker -Dealers And clearing Organisation [Member] | ||
Brokers And Dealers [Line Items] | ||
Receivables from Brokers-Dealers and Clearing Organizations | 2,900 | |
Allowance for Doubtful Accounts Receivable | 600 | |
Broker -Dealers And clearing Organisation [Member] | Other Receivable [Member] | ||
Brokers And Dealers [Line Items] | ||
Accounts Receivable, Net | $ 3,900 |