Accrued Restructuring - Summary of Accrued Restructuring (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Restructuring and Related Activities [Abstract] | |||||
| Beginning balance | $ 952 | $ 250 | $ 160 | $ 160 | |
| Restructuring charges and related adjustments | $ 0 | 916 | 788 | 4,179 | |
| Payments | (10) | $ (1,797) | (1,037) | $ (3,387) | |
| Ending balance | $ 1 | $ 1 | $ 250 | ||