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Final Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Nov. 14, 2019 | Dec. 31, 2018 | Apr. 25, 2018 | Dec. 31, 2017
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 416,431 |  | $ 381,850 |  | $ 252,011
Autoguide LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 41,372 |  |  |
Intangible assets |  | 37,660 |  |  |
Other current assets |  | 3,661 |  |  |
Non-current assets |  | 1,227 |  |  |
Accounts payable and current liabilities |  | (1,223) |  |  |
Long-term deferred tax liabilities |  | (949) |  |  |
Total purchase price |  | $ 81,748 |  |  |
Mobile Industrial Robots (MiR) |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 135,976 |
Intangible assets |  |  |  | 80,670 |
Other 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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