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Acquisitions - Additional Information (Detail) - USD ($) |  |  | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 25, 2018 | Feb. 26, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration |  |  | $ 31,000,000 | $ 31,000,000 |  |
Revenues |  |  | 24,100,000 |  |  |
Income (loss) before income taxes |  |  | (7,600,000) |  |  |
Goodwill |  |  | 381,850,000 | 381,850,000 | $ 252,011,000 | $ 223,343,000
Mobile Industrial Robots (MiR) |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total preliminary purchase price | $ 197,778,000 |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock | 145,200,000 |  |  |  |  |
Contingent consideration | 52,600,000 |  |  |  |  |
Arrangement range of outcomes value high |  |  | $ 115,000,000 | 115,000,000 |  |
Goodwill, not deductible for tax purposes | 136,000,000 |  |  |  |  |
Net income |  |  |  | 450,559,000 | 243,399,000 |
Goodwill | $ 135,976,000 |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 2 months 12 days |  |  |  |  |
Mobile Industrial Robots (MiR) | Fair Value Adjustment to Inventory |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income |  |  |  | 400,000 | 2,900,000 |
Mobile Industrial Robots (MiR) | Acquisition Related Costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net income |  |  |  | $ 2,900,000 | $ 400,000 |
Energid Technologies Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total preliminary purchase price |  | $ 28,000,000 |  |  |  |
Goodwill |  | 14,400,000 |  |  |  |
Acquired value of intangible assets |  | $ 12,300,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 7 years 8 months 12 days |  |  |  |
Net tangible assets |  | $ 1,000,000 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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