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Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) customer | Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 customer
Significant Accounting Policies [Line Items] |  |  |  |
Deferred financing costs recorded as a non-current asset |  | $ 3.1 | $ 4.0 |
Net deferred financing costs recorded as a non-current liability |  | 5.5 | 2.5 |
Allowance for doubtful accounts |  | $ 0.3 | $ 0.4 |
Accounting Standards Update No. 2014-09 | Scenario, Forecast |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amount of revenue that the company expect to accelerate upon adoption of new accounting standard | $ 40.0 |  |  |
Net sales | Customer concentration |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of major customers | customer |  | 2 | 2 | 2
Two customers and their related subcontractors | Net sales | Customer concentration |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Concentration percentage (as a percent) |  | 69.00% | 69.00% | 66.00%
Minimum | Building and improvements |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 10 years |  |
Minimum | Machinery and equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 3 years |  |
Minimum | Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite lived intangible assets, useful life |  | 3 years |  |
Maximum | Accounting Standards Update No. 2014-09 | Scenario, Forecast |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative effect of new accounting standard on opening retained earnings | $ 4.0 |  |  |
Maximum | Building and improvements |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 40 years |  |
Maximum | Machinery and equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 25 years |  |
Maximum | Software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite lived intangible assets, useful life |  | 10 years |  |
Aerospace Composites Malaysia Sdn. Bhd. |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Interest in affiliated company, accounted for using equity method of accounting (as a percent) |  | 50.00% |  |

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