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Final Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 25, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 453,859 | $ 416,431 | $ 381,850 |
Autoguide LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 41,223 |  |  |
Intangible assets | 37,660 |  |  |
Other current assets | 3,661 |  |  |
Non-current assets | 1,227 |  |  |
Accounts payable and current liabilities | (1,223) |  |  |
Other long-term liabilities | (949) |  |  |
Total purchase price | $ 81,599 |  |  |
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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