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Contracts with Customers - Summary of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 28, 2018	Sep. 30, 2019	Sep. 28, 2018
Disaggregation Of Revenue [Line Items]
Revenues	$ 1,023,277	$ 976,157	$ 2,917,424	$ 2,631,568
Fixed-Price
Disaggregation Of Revenue [Line Items]
Revenues	288,316	300,225	850,658	833,224
Time-and-Materials
Disaggregation Of Revenue [Line Items]
Revenues	285,586	254,435	810,656	732,555
Cost-Plus
Disaggregation Of Revenue [Line Items]
Revenues	$ 449,375	$ 421,497	$ 1,256,110	$ 1,065,789

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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