Cost in Excess of Net Assets of Companies Acquired - Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011	Sep. 29, 2012 Customer Relationships [Member] Years	Dec. 31, 2011 Customer Relationships [Member] Years	Sep. 29, 2012 Patented Technology [Member] Years	Dec. 31, 2011 Patented Technology [Member] Years	Dec. 31, 2011 Procurement Agreement [Member] Years	Sep. 29, 2012 Other Intangible Assets [Member] Years		Dec. 31, 2011 Other Intangible Assets [Member]		Sep. 29, 2012 Trade Names [Member]	Dec. 31, 2011 Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life						11	11	5	6	5
Gross Carrying Amount	$ 521,753		$ 521,753		$ 484,331	$ 325,757	$ 267,729	$ 12,006	$ 11,029	$ 12,000	$ 4,990	[1]	$ 14,573	[1]	$ 179,000	$ 179,000
Accumulated Amortization	(97,205)		(97,205)		(91,568)	(91,637)	(69,762)	(2,121)	(693)	(11,400)	(3,447)	[1]	(9,713)	[1]	0	0
Net	424,548		424,548		392,763	234,120	197,967	9,885	10,336	600	1,543	[1]	4,860	[1]	179,000	179,000
Finite-Lived Intangible Assets, Useful Life, Minimum											1
Finite-Lived Intangible Assets, Useful Life, Maximum											3
Amortization of Intangible Assets	$ 8,742	$ 9,268	$ 27,372	$ 25,431

[1] (a) Consists of non-competition agreements and sales backlog with useful lives ranging from one to three years.