Soft Dollar Arrangements - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Soft Dollar Arrangements [Abstract] | ||||
| Soft dollar credits | $ 199 | $ 235 | $ 597 | $ 705 |
| X | ||||||||||
- Definition Soft dollar arrangements. No definition available.
|
| X | ||||||||||
- Definition Soft dollar credits. No definition available.
|