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Revenue From Contracts With Customers - Disaggregation of Revenues by Major Business Line (Details) - USD ($) $ in Thousands | 3 Months Ended
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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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- 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 + Details
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