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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Oct. 03, 2016
--- | --- | --- | ---
Assets: |  |  |
Goodwill | $ 25,724 | $ 25,308 |
Tebras And PBC [Member] |  |  |
Assets: |  |  |
Current assets |  |  | $ 5,165
Property, plant and equipment |  |  | 5,716
Identifiable intangible assets |  |  | 7,354
Goodwill |  |  | 14,207
Total assets acquired |  |  | 32,442
Liabilities: |  |  |
Current liabilities |  |  | 408
Deferred tax liability |  |  | 3,079
Total liabilities assumed |  |  | 3,487
Net assets acquired |  |  | $ 28,955

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