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Acquisitions and Investment in Other Company - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 13, 2019 USD ($) | Jan. 30, 2019 USD ($) | Apr. 25, 2018 USD ($) | Feb. 26, 2018 USD ($) | Jan. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 28, 2020 USD ($) | Jun. 03, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 24,000,000.0 |  | $ 30,800,000 |  |  | $ 8,900,000 | $ 8,900,000 |  | $ 8,900,000 |  |  |
Goodwill |  |  |  |  |  | 416,431,000 | 416,431,000 | $ 453,859,000 | 416,431,000 | $ 381,850,000 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 7 years 2 months 12 days |  |  |  |
Investment impairment |  |  |  |  |  |  | 15,000,000.0 |  | 15,000,000 |  |  |
Industrial Automation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary purchase price | 81,600,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 396,483,000 | 396,483,000 | $ 433,752,000 | 396,483,000 | 363,358,000 |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | 39,705,000 | 39,705,000 | 7,227,000 | 39,705,000 |  |  |
Real War In [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  | 0 | 0 |  | 0 |  |  | $ 15,000,000.0
Repaymentof debt demanded |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |
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 |  |  | 9,100,000 | 9,100,000 |  | 9,100,000 | 31,000,000.0 |  |
Arrangement range of outcomes value high |  |  |  |  |  |  |  | 0 |  | 0 |  |
Goodwill, not deductible for tax purposes |  |  | 136,000,000.0 |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 464,602,000 | 442,082,000 |  |
Total preliminary purchase price |  |  | 197,800,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 135,976,000 |  |  |  |  |  |  |  |  |
Mobile Industrial Robots (MiR) | Fair Value Adjustment to Inventory |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 400,000 |  |
Mobile Industrial Robots (MiR) | Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 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 months 21 days |  |  |  |  |  |  |  |
Net tangible assets |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |
Lemsys [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary purchase price |  | $ 1,400,000 |  |  | $ 1,400,000 |  |  |  |  |  |  |
Total preliminary purchase price |  |  |  |  | 9,100,000 |  |  |  |  |  |  |
Acquired value of intangible assets |  | $ 4,600,000 |  |  | 4,600,000 |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 years 2 months 12 days |  |  |  |  |  |  |  |  |  |
Net tangible assets |  | $ 3,100,000 |  |  | $ 3,100,000 |  |  |  |  |  |  |
Autoguide LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary purchase price |  |  |  |  |  |  |  | 81,599,000 |  |  |  |
Arrangement range of outcomes value high | 100,200,000 |  |  |  |  |  |  | 100,200,000 |  |  |  |
Goodwill, not deductible for tax purposes | 41,200,000 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 1,400,000 |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  | (900,000) |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 41,223,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 6 years 1 month 6 days |  |  |  |
Autoguide LLC [Member] | Industrial Automation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total preliminary purchase price | 81,600,000 |  |  |  |  |  |  |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock | 57,600,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 24,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Arrangement range of outcomes value high |  |  |  |  |  | $ 100,200,000 | $ 100,200,000 |  | 100,200,000 |  |  |
Quantity of material to be transported | 4,500 |  |  |  |  |  |  |  |  |  |  |
Business acquisition percentage of equity | 100.00% |  |  |  |  |  |  |  |  |  |  |
Autoguide LLC [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 100,000 | 100,000 |  |
Autoguide LLC [Member] | Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 1,200,000 |  |

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