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Fair Value Measurements - Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 9 Months Ended
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Oct. 01, 2017 | Oct. 02, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Payment of contingent consideration | $ (1,926) | $ (337)
Foreign Currency Transaction Gain (Loss), Unrealized | 39 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 4,173 |
Ending balance | 3,673 |
EnShape | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Payment of contingent consideration | (1,401) |
Manatee | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Payment of contingent consideration | (525) |
Fair value adjustment to Manatee contingent consideration | (275) |
Chiaro | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value adjustment to Manatee contingent consideration | 185 |
GVi |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value adjustment to Chiaro contingent consideration | 1,299 |
GVi | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value adjustment to Manatee contingent consideration | $ 178 |

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