Cost in Excess of Net Assets of Companies Acquired and Intangible Assets, net Cost in Excess of Net Assets of Companies Acquired and Intangible Assets, net - Intangible Assets (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012		Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 567,478					$ 518,424					$ 567,478		$ 518,424
Accumulated amortization	(141,409)					(104,391)					(141,409)		(104,391)
Intangible assets, net	426,069					414,033					426,069		414,033
Amortization of Intangible Assets											36,769		36,508		35,359
Amortization of Intangible Assets Net of Tax	8,120		7,074	7,029	7,116	7,255		7,145	7,360	7,576	29,339		29,336		27,070
Amortization of Intangible Assets Net of Tax Per Share Basic and Diluted	$ 0.08		$ 0.07	$ 0.07	$ 0.07	$ 0.07		$ 0.07	$ 0.07	$ 0.07	$ 0.29		$ 0.27		$ 0.24
Amortization of Intangible Assets Net of Tax Per Share Diluted											$ 0.28		$ 0.26		$ 0.23
Future Amortization Expense, Year One	42,375										42,375
Future Amortization Expense, Year Two	41,101										41,101
Future Amortization Expense, Year Three	39,002										39,002
Future Amortization Expense, Year Four	35,207										35,207
Future Amortization Expense, Year Five	29,282										29,282
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life											11 years		11 years
Gross carrying amount	374,244					325,509					374,244		325,509
Accumulated amortization	(134,817)					(100,172)					(134,817)		(100,172)
Intangible assets, net	239,427					225,337					239,427		225,337
Patented Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life											5 years		5 years
Gross carrying amount	9,625					11,154					9,625		11,154
Accumulated amortization	(4,051)					(2,508)					(4,051)		(2,508)
Intangible assets, net	5,574					8,646					5,574		8,646
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	4,609	[1]				2,761	[1]				4,609	[1]	2,761	[1]
Accumulated amortization	(2,541)	[1]				(1,711)	[1]				(2,541)	[1]	(1,711)	[1]
Intangible assets, net	2,068	[1]				1,050	[1]				2,068	[1]	1,050	[1]
Acquired Finite-lived Intangible Asset, Useful Life, Minimum													1
Acquired Finite-lived Intangible Asset, Useful Life, Maximum													3
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	179,000					179,000					179,000		179,000
Accumulated amortization	0					0					0		0
Intangible assets, net	$ 179,000					$ 179,000					$ 179,000		$ 179,000

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