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) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2015 USD ($)		Sep. 26, 2015 USD ($)	Jun. 27, 2015 USD ($)	Mar. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)		Sep. 27, 2014 USD ($)	Jun. 28, 2014 USD ($)	Mar. 29, 2014 USD ($)	Dec. 31, 2015 USD ($) $ / shares		Dec. 31, 2014 USD ($) Years $ / shares		Dec. 31, 2013 USD ($) $ / shares
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 613,390					$ 513,561					$ 613,390		$ 513,561
Accumulated amortization	(224,064)					(177,850)					(224,064)		(177,850)
Intangible assets, net	389,326					335,711					389,326		335,711
Impairment of Intangible Assets (Excluding Goodwill)													78,000
Impairment of intangible assets (excluding Goodwill), Net of Tax													$ 47,911
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Basic | $ / shares													$ 0.49
Impairment of Intangible Assets (Excluding Goodwill), Net of Tax Per Share Diluted | $ / shares													$ 0.48
Amortization of Intangible Assets											51,036		$ 44,063		$ 36,769
Amortization of Intangible Assets Net of Tax	(9,537)		$ (11,521)	$ (11,169)	$ (9,029)	(9,105)		$ (9,086)	$ (8,867)	$ (8,907)	$ (41,256)		$ (35,965)		$ (29,339)
Amortization of Intangible Assets Net of Tax Per Share Basic | $ / shares											$ (0.44)		$ (0.36)		$ (0.29)
Amortization of Intangible Assets Net of Tax Per Share Diluted | $ / shares											$ (0.43)		$ (0.36)		$ (0.28)
Future Amortization Expense, Year One	51,758										$ 51,758
Future Amortization Expense, Year Two	48,728										48,728
Future Amortization Expense, Year Three	43,198										43,198
Future Amortization Expense, Year Four	36,853										36,853
Future Amortization Expense, Year Five	30,256										$ 30,256
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life											10 years		10 years
Gross carrying amount	498,319					402,036					$ 498,319		$ 402,036
Accumulated amortization	(215,263)					(171,071)					(215,263)		(171,071)
Intangible assets, net	283,056					230,965					$ 283,056		$ 230,965
Patented Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life											5 years		5 years
Gross carrying amount	13,154					8,806					$ 13,154		$ 8,806
Accumulated amortization	(7,894)					(5,444)					(7,894)		(5,444)
Intangible assets, net	5,260					3,362					5,260		3,362
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	917	[1]				1,719	[2]				917	[1]	1,719	[2]
Accumulated amortization	(907)	[1]				(1,335)	[2]				(907)	[1]	(1,335)	[2]
Intangible assets, net	10	[1]				384	[2]				10	[1]	$ 384	[2]
Acquired Finite-lived Intangible Asset, Useful Life, Minimum | Years													2
Acquired Finite-lived Intangible Asset, Useful Life, Maximum | Years													3
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	101,000					101,000					101,000		$ 101,000
Accumulated amortization	0					0					0		0
Intangible assets, net	$ 101,000					$ 101,000					$ 101,000		$ 101,000

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjQ4MDNhMmEyMTI3ZjRkYzVhMWJjMDc0MTAwOWM2Njk4fFRleHRTZWxlY3Rpb246Q0NGMUUyOTAyOUFBM0ZEMEJGN0Q3OTJCQkRBRUIxQTAM}

[2] Consists of non-competition agreements with useful lives ranging from two to three years.