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Restructuring and Lease Charges, Net (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Jan. 01, 2012
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
employees
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
Human Health [Member]
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
Environmental Health [Member]
Sep. 30, 2012
Q3 2012 Restructuring Plan [Member]
Severance [Member]
Jul. 01, 2012
Q2 2012 Restructuring Plan [Member]
employees
Sep. 30, 2012
Q2 2012 Restructuring Plan [Member]
Sep. 30, 2012
Q2 2012 Restructuring Plan [Member]
Human Health [Member]
Sep. 30, 2012
Q2 2012 Restructuring Plan [Member]
Environmental Health [Member]
Sep. 30, 2012
Q2 2012 Restructuring Plan [Member]
Severance [Member]
Apr. 01, 2012
Q1 2012 Restructuring Plan [Member]
employees
Sep. 30, 2012
Q1 2012 Restructuring Plan [Member]
Sep. 30, 2012
Q1 2012 Restructuring Plan [Member]
Human Health [Member]
Sep. 30, 2012
Q1 2012 Restructuring Plan [Member]
Environmental Health [Member]
Sep. 30, 2012
Q1 2012 Restructuring Plan [Member]
Severance [Member]
Sep. 30, 2012
Q1 2012 Restructuring Plan [Member]
Closure Of Excess Facility Space [Member]
Jan. 01, 2012
Q4 2011 Restructuring Plan [Member]
employees
Sep. 30, 2012
Q4 2011 Restructuring Plan [Member]
Jan. 01, 2012
Q4 2011 Restructuring Plan [Member]
Human Health [Member]
Jan. 01, 2012
Q4 2011 Restructuring Plan [Member]
Environmental Health [Member]
Sep. 30, 2012
Q4 2011 Restructuring Plan [Member]
Severance [Member]
Jan. 01, 2012
Q4 2011 Restructuring Plan [Member]
Severance [Member]
Sep. 30, 2012
Q4 2011 Restructuring Plan [Member]
Closure Of Excess Facility Space [Member]
Jan. 01, 2012
Q4 2011 Restructuring Plan [Member]
Closure Of Excess Facility Space [Member]
Jul. 03, 2011
Q2 2011 Restructuring Plan [Member]
employees
Jul. 03, 2011
Q2 2011 Restructuring Plan [Member]
Human Health [Member]
Jul. 03, 2011
Q2 2011 Restructuring Plan [Member]
Environmental Health [Member]
Sep. 30, 2012
Q2 2011 Restructuring Plan [Member]
Severance [Member]
Jan. 01, 2012
Q2 2011 Restructuring Plan [Member]
Severance [Member]
Sep. 30, 2012
Previous restructuring and integration plans [Member]
Sep. 30, 2012
Previous restructuring and integration plans [Member]
Severance [Member]
Sep. 30, 2012
Previous restructuring and integration plans [Member]
Closure Of Excess Facility Space [Member]
Sep. 30, 2012
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]                                                                          
Restructuring charges before tax $ 9,672,000 $ 0 $ 21,034,000 $ 3,340,000     $ 3,700,000 $ 3,700,000       $ 5,600,000 $ 200,000       $ 5,400,000 $ 1,000,000         $ 2,300,000 $ 4,600,000           $ 2,200,000 $ 3,400,000            
Restructuring and Related Cost, Remaining Cost                     4,100,000         100,000                                          
Additional accrual for estimated sublease rental payments and (reversal) related to lower than expected cost associated with workforce reductions                                           (135,000)     0   (135,000)               400,000 300,000 800,000
Number of employees reduced           66       215         121           114               72                
Remaining payments 21,161,000   21,161,000   13,958,000       7,416,000         3,646,000   2,010,000     2,010,000 0 5,044,000 742,000     742,000 4,674,000 0 370,000       779,000 1,283,000 11,900,000     1,700,000
Restructuring Reserve, Settled with Cash                                                                         1,100,000
Payments for Restructuring                                                                   $ 3,300,000