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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Net balance at January 1 | $ 422,185,000 | $ 333,276,000 |
Additions (Note 13) | 0 | 74,453,000 |
Goodwill, Impairment Loss | 0 | 0 | $ 0
Disposal Group, Including Discontinued Operation, Goodwill |  | 0 |
Currency translation | (8,020,000) | 14,456,000 |
Net balance at December 31 | 413,640,000 | $ 422,185,000 | $ 333,276,000
Sordin |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Impairment Loss | $ 525,000 |  |

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