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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 585,301	$ 469,129	$ 1,079,271	$ 914,892
RMS
Disaggregation of Revenue [Line Items]
Total revenue	130,426	124,002	264,384	251,163
DSA
Disaggregation of Revenue [Line Items]
Total revenue	346,416	252,092	606,408	479,850
Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	108,459	$ 93,035	208,479	$ 183,879
Services and products transferred over time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	48,804		97,530
Services and products transferred over time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	346,226		605,970
Services and products transferred over time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	32,987		61,558
Services and products transferred at a point in time | RMS
Disaggregation of Revenue [Line Items]
Total revenue	81,622		166,854
Services and products transferred at a point in time | DSA
Disaggregation of Revenue [Line Items]
Total revenue	190		438
Services and products transferred at a point in time | Manufacturing
Disaggregation of Revenue [Line Items]
Total revenue	$ 75,472		$ 146,921

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
-Topic 606
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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