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Acquisitions - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 11, 2015 | Mar. 31, 2016 | Oct. 04, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  | $ 1,050,000 | $ 11,697,000 |  |
Universal Robots |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total purchase price | $ 315,437,000 |  |  |  |  |  |
Cash paid to acquire outstanding common and preferred stock | 283,800,000 |  |  |  |  |  |
Contingent consideration | 31,600,000 |  |  |  |  |  |
Arrangement range of outcomes value high | 65,000,000 |  |  |  |  |  |
Payments of contingent consideration |  | $ 15,000,000 |  |  | $ 15,000,000 |  |
EBITDA contingent consideration amount, percentage |  | 100.00% |  |  | 100.00% |  |
Maximum payment per earn-out |  |  |  | $ 25,000,000 |  |  |
Goodwill, not deductible for tax purposes | $ 221,100,000 |  |  |  |  |  |
Revenues |  |  | $ 41,900,000 |  |  |  |
Income (loss) before income taxes |  |  | $ (7,600,000) |  |  |  |
Net income |  |  |  |  |  | $ 199,784,000 |
Universal Robots | Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 24,500,000
Universal Robots | Fair Value Adjustment to Inventory |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net income |  |  |  |  |  | 1,600,000 |
Universal Robots | Acquisition Related Costs |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net income |  |  |  |  |  | $ 1,000,000 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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