Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Corporate Segment
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 150,455	$ 136,297
Corporate Segment | Military and Space Defense Electronics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	54,500	48,923
Corporate Segment | Military and Space Defense Structures
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,840	14,521
Corporate Segment | Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	72,470	58,385
Corporate Segment | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,645	14,468
Structural Systems
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	68,046	57,575
Structural Systems | Military and Space Defense Structures
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11,840	14,521
Structural Systems | Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	56,206	43,054
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	82,409	78,722
Electronic Systems | Military and Space Defense Electronics
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	54,500	48,923
Electronic Systems | Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	16,264	15,331
Electronic Systems | Industrial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 11,645	$ 14,468