Off-Balance-Sheet Risk and Concentration of Credit Risk (Detail) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Off-Balance-Sheet Risk and Concentration of Credit Risk [Abstract] | ||
| Receivables from clearing broker | $ 34,160 | $ 44,466 |
| X | ||||||||||
- Definition Off-Balance-Sheet Risk and Concentration of Credit Risk [Abstract] No definition available.
|
| X | ||||||||||
- Definition Amount of right to receive cash and securities on deposit with clearing organizations. Clearing organizations perform post trade processing and trade comparisons among numerous broker-dealers and act as settlement agents between buying and selling broker-dealers. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|