Investments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Investments | $ 32 | $ 1,307 |
| Maximum | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Maximum financial interest in affiliated investment funds | 2.00% |