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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2017 | Dec. 31, 2016 | Oct. 02, 2016 | Apr. 03, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Oct. 04, 2015 | Jul. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 11, 2015 | Oct. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(decrease)in contingent consideration |  |  |  |  |  |  |  |  | $ 15,896 | $ 2,489 | $ (630) |  |
Payments of contingent consideration |  |  |  |  |  |  |  |  | 11,697 |  |  |  |
Universal Robots |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(decrease)in contingent consideration |  | $ 5,400 | $ 8,000 | $ 1,200 |  | $ 5,339 |  |  | 15,300 | 5,300 |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 31,600 |
Payments of contingent consideration |  |  |  |  | $ 15,000 |  |  |  | $ 15,000 |  |  |  |
EBITDA contingent consideration amount, percentage |  | 100.00% |  |  | 100.00% |  |  |  | 100.00% |  |  |  |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(decrease)in contingent consideration |  |  |  |  |  | (300) | $ (1,000) |  | $ 600 | (1,300) |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800
Avionics Interface Technologies, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of contingent consideration | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(decrease)in contingent consideration |  |  |  |  |  |  |  | $ (1,600) |  | (1,600) | $ (600) |  |
Contingent consideration |  |  |  |  |  | $ 0 |  |  |  | $ 0 |  |  |

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