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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Oct. 03, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets: |  |  |  |
Goodwill | $ 25,308 |  | $ 11,265 | $ 11,502
Tebras And PBC [Member] |  |  |  |
Assets: |  |  |  |
Current assets |  | $ 5,165 |  |
Property, plant and equipment |  | 5,716 |  |
Identifiable intangible assets |  | 7,354 |  |
Goodwill |  | 14,327 |  |
Total assets acquired |  | 32,562 |  |
Liabilities: |  |  |  |
Current liabilities |  | 408 |  |
Deferred tax liability |  | 3,079 |  |
Total liabilities assumed |  | 3,487 |  |
Net assets acquired |  | $ 29,075 |  |

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