SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Year Entity	Dec. 31, 2010	Dec. 31, 2009
Significant Accounting Policies [Line Items]
Revenues derived from contracts of revenue, percentage	15.00%	14.00%	16.00%
Net costs and estimated earnings in excess of billings on uncompleted contracts	$ 72.2	$ 63.3
Excess over average costs on long term contracts	87.1	69.4
Allowance for doubtful accounts	8.2	7.4
Property and equipment minimum useful life	1
Property and equipment maximum useful life	50
Patent and other intangible assets, amortization period, minimum	5
Patent and other intangible assets, amortization period, maximum	34
Percentage of discounted closing price for Employee Stock Purchase Plan	85.00%
Employee Stock Purchase Plan, rights granted	0.7	0.5	0.6
Purchase of treasury stock, share	161,297	197,343	94,388
Purchase of treasury stock	$ 6.0	$ 6.7	$ 1.7
Percentage of revenues	No single customer accounted for more than 10% of the Company's consolidated net sales.	No single customer accounted for more than 10% of the Company's consolidated net sales.	No single customer accounted for more than 10% of the Company's consolidated net sales.
Company reporting units	8