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Allocation of Final Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 11, 2015
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 252,011 | $ 223,343 | $ 488,413 |
Universal Robots |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | $ 221,128
Intangible assets |  |  |  | 121,590
Current assets |  |  |  | 10,853
Non-current assets |  |  |  | 3,415
Accounts payable and current liabilities |  |  |  | (11,976)
Long-term deferred tax liabilities |  |  |  | (26,653)
Long-term other liabilities |  |  |  | (2,920)
Total purchase price |  |  |  | $ 315,437

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