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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Apr. 03, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  | $ 1,050 | $ 11,697 |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  | 7,820 | 15,896 | $ 2,489
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  | 1,100 |  |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  |  | 600 | (1,300)
Universal Robots |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  | $ 15,000 |  | $ 15,000 |
EBITDA contingent consideration amount, percentage |  |  |  |  | 100.00% |  |  | 100.00% |  | 100.00% |
Increase (decrease) in contingent consideration | $ 6,000 | $ (300) | $ 1,500 | $ 600 | $ 5,400 | $ 8,000 | $ 1,200 |  | $ 7,800 | $ 15,300 | $ 5,300

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Details
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