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Segment Information - Additional Information (Details) - item | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Number of reporting segments | 2 |  |
Net sales | Customer concentration | Airbus and its subcontractors |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 44.00% | 41.00% | 35.00%
Net sales | Customer concentration | Airbus and its subcontractors | Commercial Aerospace Market Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 40.00% |  |
Net sales | Customer concentration | Airbus and its subcontractors | Space & Defense Market Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 4.00% |  |
Net sales | Customer concentration | Airbus and its subcontractors | Composite Materials |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 50.00% | 48.00% | 42.00%
Net sales | Customer concentration | Boeing company and its subcontractors |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 25.00% | 28.00% | 31.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Commercial Aerospace Market Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 23.00% |  |
Net sales | Customer concentration | Boeing company and its subcontractors | Space & Defense Market Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 2.00% |  |
Net sales | Customer concentration | Boeing company and its subcontractors | Composite Materials |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 16.00% | 17.00% | 21.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Engineered Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration percentage (as a percent) | 64.00% | 69.00% | 71.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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