Business Acquisitions (Details) (USD $)		12 Months Ended		12 Months Ended		12 Months Ended					1 Months Ended
	Jul. 31, 2011 Aerius Photonics, LLC Thermal Vision and Measurement	Dec. 31, 2011 Aerius Photonics, LLC Customer relationships Thermal Vision and Measurement Years	Jul. 31, 2011 Aerius Photonics, LLC Customer relationships Thermal Vision and Measurement	Dec. 31, 2011 Aerius Photonics, LLC Patented/Proprietary technology Thermal Vision and Measurement Years	Jul. 31, 2011 Aerius Photonics, LLC Patented/Proprietary technology Thermal Vision and Measurement	Dec. 31, 2011 Aerius Photonics, LLC Backlog & other Thermal Vision and Measurement Years	Jul. 31, 2011 Aerius Photonics, LLC Backlog & other Thermal Vision and Measurement	Dec. 31, 2011 Tacktick Ltd And Belamarin OY Raymarine	May 31, 2010 Raymarine	Oct. 31, 2010 ICx Technologies	Oct. 31, 2010 ICx Technologies Restricted stock units	Oct. 31, 2010 ICx Technologies Discontinued Operations	Oct. 31, 2010 ICx Technologies Surveillance Continuing Operations	Oct. 31, 2010 ICx Technologies Detection Continuing Operations	Oct. 31, 2010 ICx Technologies Integrated Systems Continuing Operations	Oct. 31, 2010 ICx Technologies Thermal Vision and Measurement Continuing Operations
Business Acquisition [Line Items]
Business acquisition, purchase price	$ 27,036,000							$ 5,100,000	$ 177,800,000	$ 264,200,000
Business acquisition, cash paid										266,341,000
Business acquisition, purchase price allocation, intangible assets	8,830,000							1,100,000		57,430,000		1,740,000	25,730,000	16,750,000	12,080,000	1,130,000
Business acquisition, purchase price allocation, goodwill	16,452,000							1,500,000		110,956,000		0	52,665,000	38,162,000	20,129,000	0
Business acquisition, stock options assumed, shares issuable											331,386
Business acquisition, stock options assumed, shares issuable value											2,100,000
Cash acquired	3,629,000									36,197,000
Accounts receivable, net	2,567,000									24,405,000
Inventories	49,000									41,982,000
Property and equipment	851,000									9,016,000
Other assets	132,000									13,947,000
Liabilities	(5,474,000)									(41,661,000)
Net tangible assets	1,754,000									83,886,000
Deferred taxes, net										14,069,000
Weighted average estimated useful life		7		7		2
Gross carrying amount	$ 8,830,000		$ 780,000		$ 6,500,000		$ 1,550,000