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Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 25, 2018 | Dec. 31, 2018 | Dec. 31, 2016
Finite-Lived Intangible Assets |  |  |
Impairment of intangible assets |  | $ 8,800 | $ 83,339
Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets |  |  |
Impairment of intangible assets |  | 8,800 |
Mobile Industrial Robots (MiR) |  |  |
Finite-Lived Intangible Assets |  |  |
Intangible assets acquired | $ 80,670 | 80,700 |
Energid Technologies Corporation |  |  |
Finite-Lived Intangible Assets |  |  |
Intangible assets acquired |  | $ 12,300 |

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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