Major Customers and Concentrations of Credit Risk - Sales to Major Customers (Detail) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Boeing
Revenue, Major Customer [Line Items]
Concentration percentage	17.30%	16.00%	19.40%
Raytheon
Revenue, Major Customer [Line Items]
Concentration percentage	8.40%	8.70%	9.40%
Spirit
Revenue, Major Customer [Line Items]
Concentration percentage	8.20%	7.40%	6.40%
United Technologies
Revenue, Major Customer [Line Items]
Concentration percentage	6.00%	6.10%	5.50%
Top Ten Customers
Revenue, Major Customer [Line Items]
Concentration percentage	58.60%	55.70%	59.20%

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.

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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611

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