Segment Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Dec. 31, 2010
Segment Reporting Information [Line Items]
Segment revenue	$ 417,433	$ 318,210	$ 1,208,895	$ 970,588
Operating income (loss)	80,137	61,606	247,404	195,656
Accounts receivable	287,670		287,670		222,820
Inventories	215,681		215,681		192,852
Goodwill	1,312,480		1,312,480		828,737
Engineering And Construction [Member]
Segment Reporting Information [Line Items]
Segment revenue	241,106	189,598	667,808	535,657
Operating income (loss)	42,634	36,589	112,400	89,317
Accounts receivable	175,273		175,273		131,808
Inventories	126,552		126,552		123,780
Goodwill	708,639		708,639		432,364
Field Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenue	91,106	67,240	318,188	243,299
Operating income (loss)	31,030	21,027	126,078	89,320
Accounts receivable	60,248		60,248		52,065
Inventories	39,822		39,822		33,964
Goodwill	69,623		69,623		26,211
Mobile Solutions [Member]
Segment Reporting Information [Line Items]
Segment revenue	58,101	37,692	142,747	113,839
Operating income (loss)	2,503	(83)	(1,515)	2,140
Accounts receivable	34,608		34,608		24,806
Inventories	31,207		31,207		16,721
Goodwill	510,382		510,382		348,166
Advanced Devices [Member]
Segment Reporting Information [Line Items]
Segment revenue	27,120	23,680	80,152	77,793
Operating income (loss)	3,970	4,073	10,441	14,879
Accounts receivable	17,541		17,541		14,141
Inventories	18,100		18,100		18,387
Goodwill	$ 23,836		$ 23,836		$ 21,996
Number of operation accounts			0
Maximum percentage of operation accounts for company's total revenue, operating income, and assets			10.00%