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Final Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Apr. 25, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 379,513 | $ 381,850 |
Mobile Industrial Robots (MiR) |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill |  |  | $ 135,976
Intangible assets |  |  | 80,670
Current assets |  |  | 6,039
Non-current assets |  |  | 1,336
Accounts payable and current liabilities |  |  | (7,336)
Long-term deferred tax liabilities |  |  | (18,007)
Other long-term liabilities |  |  | (900)
Total purchase price |  |  | $ 197,778

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