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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  | $ 8,852 | $ 27,615 | $ 13,571
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  | (23,271) | (19,257) | $ 987
Universal Robots (UR) |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  |  | 30,800 |
Increase (decrease) in contingent consideration |  | $ 27,200 | $ 29,900 | $ 10,000 |  | $ 7,800 | $ 11,700 | $ 3,000 |  | 3,800 |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  | 8,900 |  |
MiR |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  | 3,500 | 22,200 |
Autoguide LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration | $ 15,300 |  | $ 600 |  | $ 3,000 |  |  |  |  | $ 3,000 |
Autoguide LLC [Member] | Dispute In Respect Of Contingent Consideration [Member] |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration |  |  |  |  |  |  |  |  | $ 19,700 |  |

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