Segment Information (Details 3) (Net sales, Customer concentration)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Boeing company and its subcontractors
Segment information
Concentration percentage (as a percent)	29.00%	30.00%	31.00%
Boeing company and its subcontractors | Composite Materials
Segment information
Concentration percentage (as a percent)	19.00%	20.00%	22.00%
Boeing company and its subcontractors | Engineered Products
Segment information
Concentration percentage (as a percent)	66.00%	64.00%	62.00%
EADS, Airbus and its subcontractors
Segment information
Concentration percentage (as a percent)	28.00%	27.00%	24.00%
EADS, Airbus and its subcontractors | Composite Materials
Segment information
Concentration percentage (as a percent)	34.00%	33.00%	29.00%