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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value adjustment |  |  |  |  |  |  |  |  |  | $ (19,257) | $ 987 | $ 7,820
Severance benefit and charges | $ 500 |  | $ 7,800 | $ 800 | $ 800 | $ 800 |  | $ 3,900 | $ 2,400 |  |  |
Acquisition related expense and compensation | 200 |  | 800 | 500 | 1,300 | 500 | $ 800 | 800 | 2,500 |  |  |
Pension and post retirement net actuarial gains (losses) | (7,700) |  |  |  |  | 3,500 |  |  |  |  |  |
Investment impairment | 15,000 |  |  |  |  |  |  |  |  | 15,000 |  |
Universal Robots (UR) |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value adjustment |  |  |  | $ 11,700 | $ 3,000 | 7,400 |  | $ 5,000 | $ 3,500 | 3,800 | 16,700 |
Severance benefit and charges |  | $ 1,700 | $ 500 |  |  |  | $ 800 |  |  |  |  |
Mobile Industrial Robots (MiR) |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value adjustment | 5,800 |  |  |  |  | $ 17,700 |  |  |  |  | $ 17,700 |
Autoguide LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration fair value adjustment | $ 3,000 |  |  |  |  |  |  |  |  | $ 3,000 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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