Employee Benefits - Additional Information (Detail) |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
USD ($)
| |
| Defined Contribution Plan Disclosure [Line Items] | |
| Defined benefit plan contribution by employer | $ 0 |
| Minimum [Member] | |
| Defined Contribution Plan Disclosure [Line Items] | |
| Defined contribution plan eligibility years of age for employees | 21 years |