Goodwill and Intangible Assets, Net (Changes in the Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 01, 2012
Changes in the carrying amount of goodwill
Balance at January 1, 2012	$ 2,093,626
Foreign currency translation	9,433
Balance at April 1, 2012	2,103,059
Human Health [Member]
Changes in the carrying amount of goodwill
Balance at January 1, 2012	1,390,571
Foreign currency translation	6,267
Balance at April 1, 2012	1,396,838
Environmental Health [Member]
Changes in the carrying amount of goodwill
Balance at January 1, 2012	703,055
Foreign currency translation	3,166
Balance at April 1, 2012	$ 706,221

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details