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Revenue From Contracts With Customers - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 493,970	$ 445,763
RMS
Disaggregation of Revenue [Line Items]
Total revenue	133,958	127,161
DSA
Disaggregation of Revenue [Line Items]
Total revenue	259,992	227,758
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	100,020	$ 90,844
Services and products transferred over time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	48,726
Services and products transferred over time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	259,744
Services and products transferred over time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	28,571
Services and products transferred at a point in time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	85,232
Services and products transferred at a point in time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	248
Services and products transferred at a point in time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	$ 71,449

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+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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