Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | $ 32,081 | $ 37,360 |
| Accumulated Amortization | 30,617 | 35,026 |
| Total | 1,464 | 2,334 |
| Customer Relationships [Member] | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 30,998 | 32,270 |
| Accumulated Amortization | 29,534 | 29,936 |
| Total | 1,464 | 2,334 |
| Research Content [Member] | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 1,083 | 3,583 |
| Accumulated Amortization | $ 1,083 | 3,583 |
| Technology [Member] | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Gross Carrying Amount | 1,507 | |
| Accumulated Amortization | $ 1,507 |