Goodwill and Intangible Assets, Net (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2014
Changes in the carrying amount of goodwill
Balance at beginning of period	$ 2,143,120
Foreign currency translation	(1,301)
Balance at end of period	2,141,819
Human Health [Member]
Changes in the carrying amount of goodwill
Balance at beginning of period	1,648,332
Foreign currency translation	(1,006)
Balance at end of period	1,647,326
Environmental Health [Member]
Changes in the carrying amount of goodwill
Balance at beginning of period	494,788
Foreign currency translation	(295)
Balance at end of period	$ 494,493