Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Entity	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Revenues derived from percentage of completion accounting, percentage	16.00%	15.00%	15.00%
Net costs and estimated earnings in excess of billings on uncompleted contracts	$ 81.9	$ 95.9
Excess over average costs on long term contracts	213.4	134.4
Allowance for doubtful accounts	10.4	12.1
Number of reportable units	6
Percentage of discounted closing price for Employee Stock Purchase Plan	85.00%
Employee Stock Purchase Plan, rights granted	1.1	0.9	0.7
Purchase of treasury stock, share	41,376	60,266	161,297
Purchase of treasury stock	$ 3.3	$ 2.6	$ 6.0
Percentage of revenues	No other individual customers accounted for more than 10% of the Company's consolidated revenues	No other individual customers accounted for more than 10% of the Company's consolidated revenues	No single customer accounted for more than 10% of the Company's consolidated revenues
Boeing | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of net sales	11.60%	11.10%
Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	1 year
Patent and other intangible assets, amortization period	3 years
Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	50 years
Patent and other intangible assets, amortization period	34 years