Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Property Plant And Equipment Useful Life And Values [Abstract] | |||
| Depreciation expense | $ 719 | $ 546 | $ 423 |