Acquisitions - Additional Information (Detail)	9 Months Ended		0 Months Ended		9 Months Ended		0 Months Ended				0 Months Ended		1 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 18, 2013 FTL Seals Technology, Ltd USD ($)	Mar. 18, 2013 FTL Seals Technology, Ltd GBP (£)	Sep. 30, 2013 FTL Seals Technology, Ltd USD ($)	Sep. 30, 2013 FTL Seals Technology, Ltd GBP (£)	Apr. 11, 2012 Precision Photonics Corporation USD ($)	Apr. 30, 2013 ERC USD ($)	Apr. 30, 2013 ERC JPY (¥)	Apr. 30, 2012 ERC USD ($)	Jul. 20, 2012 Matcon Group Limited USD ($)	Jul. 20, 2012 Matcon Group Limited GBP (£)	Apr. 30, 2013 Matcon Group Limited USD ($)	Sep. 30, 2013 Matcon Group Limited USD ($)
Business Acquisition [Line Items]
Annual revenue of entity acquired					$ 22,500,000	£ 15,000,000
Aggregate purchase price			34,500,000	23,100,000			20,600,000	18,000,000	1,470,000,000		45,800,000	29,100,000
Goodwill	1,344,176,000	1,321,727,000	17,994,000				13,900,000			8,500,000	28,000,000
Intangible assets			13,016,000
Acquisition-related transaction costs	1,400,000
Non cash acquistion related costs	1,800,000
Intangible assets acquired other than goodwill							5,100,000			5,600,000	14,100,000
Goodwill not deductible for tax purpose							13,900,000			8,500,000	28,000,000
Business acquisition, cash consideration paid								13,300,000			35,000,000
Business acquisition, assumption of debt			5,939,000							4,700,000
Business acquisition, working capital adjustments											2,400,000
Contingent consideration fair value	4,890,000	9,043,000									8,400,000			4,900,000
Payment under contingent consideration arrangement													3,800,000
Business acquisition, minimum potential undiscounted amount of all future payments														0
Business acquisition, maximum potential undiscounted amount of all future payments														4,900,000
Business acquisition, amount financed with borrowings under the revolving facility											$ 15,000,000