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Acquisitions - Additional Information (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Business | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Number of businesses acquired | Business |  | 2 |  |  |
Business acquisition cash paid |  | $ 64.1 |  |  |
Contingent consideration liability |  | 2.9 |  |  |
Goodwill |  |  |  |  | $ 107.7
Debt instrument, interest rate |  |  |  |  | 4.70%
Luminati | 8% convertible secured promissory note |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 8.00% |  |
Face value |  |  | $ 10.0 |  |
Debt instrument, maturity year |  |  | 2023 |  |
OPM |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business combination returned shares value |  | 20.0 |  |  |
Purchase price |  |  | $ 15.0 |  |
Structil SA and Aerospace and OPM |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 38.0 |  |  |
Recognized intangiable assets and liabilities |  | $ 32.0 |  |  |
Formax |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 10.2 |  |  |  |
Purchase price | $ 12.0 |  |  | $ 22.0 |
Percentage of ownership interest acquired | 50.00% |  |  | 50.00% |
Long-term debt assumed |  |  |  | $ 8.2 |

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