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Acquisitions and Investment In Other Company - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 25, 2018 | Feb. 26, 2018 | Jan. 30, 2019 | Jul. 01, 2018 | Jul. 01, 2018 | Jun. 30, 2019 | Jun. 03, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  | $ 30,800,000
Goodwill |  |  |  |  |  | 383,936,000 |  | 381,850,000
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | 26,847,000 |  | $ 70,543,000
Revenues |  |  |  | $ 400,000 | $ 400,000 |  |  |
Real War In [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  | $ 15,000,000.0 |
Investments, Fair Value Disclosure |  |  |  |  |  | 15,000,000.0 |  |
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 |  |  |  |  |  | $ 84,100,000 |  |
Goodwill, not deductible for tax purposes | 136,000,000.0 |  |  |  |  |  |  |
Net income |  |  |  | 101,780,000 | 186,787,000 |  |  |
Goodwill | $ 135,976,000 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years 2 months 12 days |  |  |  |  |  |  |
Mobile Industrial Robots (MiR) | Acquisition Related Costs |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Net income |  |  |  | $ 2,300,000 | $ 2,900,000 |  |  |
Energid Technologies Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total preliminary purchase price |  | $ 27,600,000 |  |  |  |  |  |
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 |  | $ 1,000,000.0 |  |  |  |  |  |
Lemsys [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total preliminary purchase price |  |  | $ 1,400,000 |  |  |  |  |
Total preliminary purchase price |  |  | 9,100,000 |  |  |  |  |
Acquired value of intangible assets |  |  | $ 4,600,000 |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years 2 months 12 days |  |  |  |  |
Net tangible assets |  |  | $ 3,100,000 |  |  |  |  |

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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 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 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=116868840&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=116869197&loc=d3e4845-128472 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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