Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Goodwill and Intangible Assets Disclosure [Abstract] | |||
| Goodwill | $ 74,565,000 | $ 11,265,000 | |
| Impairment of goodwill | 0 | 0 | $ 0 |
| Amortization expense | $ 1,300,000 | $ 900,000 | $ 900,000 |