Acquisitions (Details) (USD $)	9 Months Ended	1 Months Ended
	Oct. 02, 2011	Jan. 31, 2011 ICM Corp. [Member]	Apr. 30, 2011 Poliron Cabos Electricos Especiais Ltda [Member]	Aug. 31, 2011 Byres Security, Inc. [Member]
Business Acquisition [Line Items]
Acquisitions for cash	$ 59,708,000	$ 21,900,000	$ 29,200,000	$ 7,200,000
Acquisitions (Textual) [Abstract]
Good will due to the ICM, Poliron, and Byres acquisitions	28,300,000
Intangible assets due to the ICM, Poliron, and Byres acquisitions	$ 21,500,000