Compensation Cost Related to Non-Vested Awards not Yet Recognized and Weighted Average Recognition Period (Detail) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2016 |
Dec. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Total | $ 1,992 | $ 3,038 |
| Stock Options | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock options, amount | $ 1,016 | $ 1,476 |
| Compensation cost not yet recognized, period for recognition | 1 year 7 months 24 days | 2 years 26 days |
| Restricted Stock | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Restricted stock, amount | $ 976 | $ 1,562 |
| Compensation cost not yet recognized, period for recognition | 1 year 2 months 16 days | 1 year 11 months 12 days |