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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 36,876 | $ 32,818
Accumulated Amortization | 31,925 | 32,086
Total | 4,951 | 732
Customer Relationships [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 32,823 | 31,735
Accumulated Amortization | 31,604 | 31,003
Total | 1,219 | 732
Research Content [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 1,083
Accumulated Amortization |  | $ 1,083
Technology [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,610 |
Accumulated Amortization | 295 |
Total | 3,315 |
Trade Names [Member] |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 443 |
Accumulated Amortization | 26 |
Total | $ 417 |

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