Acquisitions - Additional Information (Detail)	9 Months Ended		1 Months Ended			1 Months Ended			1 Months Ended					1 Months Ended				1 Months Ended
	Sep. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Apr. 30, 2012 Precision Photonics Corporation USD ($)	Sep. 30, 2012 Precision Photonics Corporation USD ($)	Apr. 11, 2012 Precision Photonics Corporation USD ($)	Apr. 30, 2012 Erc USD ($)	Apr. 30, 2012 Erc JPY (¥)	Sep. 30, 2012 Erc USD ($)	Jul. 31, 2012 Matcon Group Limited USD ($)	Jul. 31, 2012 Matcon Group Limited GBP (£)	Sep. 30, 2012 Matcon Group Limited USD ($)	Jul. 20, 2012 Matcon Group Limited USD ($)	Jul. 20, 2012 Matcon Group Limited GBP (£)	Feb. 29, 2012 At Films USD ($)	Jan. 31, 2011 At Films USD ($)	Mar. 31, 2011 Microfluidics USD ($)	Mar. 11, 2011 Microfluidics USD ($)	Jun. 30, 2011 Cvi Mg USD ($)	Jun. 10, 2011 Cvi Mg USD ($)
Business Acquisition [Line Items]
Annual revenue of entity acquired			$ 7,000,000			$ 27,000,000	¥ 2,140,000,000
Aggregate purchase price					20,600,000	18,300,000	1,470,000,000					45,600,000	29,100,000		34,500,000		18,500,000		394,700,000
Goodwill recognized in acquisition	52,285,000			13,986,000	14,000,000	10,500,000		10,506,000			27,793,000	27,800,000			18,200,000		5,900,000		208,500,000
Intangible assets recognized in acquisition					5,100,000	5,600,000						14,100,000			11,400,000		9,700,000		115,800,000
Acquisition cash payment made for funded from operation					20,600,000
Goodwill not deductible for tax purpose					14,000,000	10,500,000											5,900,000
Business acquisition, cash consideration paid						13,600,000						34,800,000			31,800,000				393,300,000
Contingent consideration value as of opening balance sheet date	9,870,000	3,000,000				4,700,000						8,400,000			2,700,000				1,400,000
Acquired entity, approximate annual revenue									34,400,000	22,000,000
Business acquisition, working capital adjustments												2,400,000
Business acquisition, minimum potential undiscounted amount of all future payments												0
Business acquisition, maximum potential undiscounted amount of all future payments												15,000,000
Business acquisition, amount financed with borrowings under the revolving facility												15,000,000
Acquisition-related transaction costs	2,400,000
Fair value of inventory charges associated with acquisitions	900,000
Annual revenue of entity acquired															9,000,000	16,000,000		178,000,000
Contingent consideration paid														1,500,000
Contingent consideration yet to be paid accounted as accrued liabilities														1,500,000
Goodwill deductible for tax purpose															18,200,000				117,700,000
Purchase price financed with borrowings under revolving credit facility																		$ 365,000,000