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Acquisitions - Schedule of Supplemental Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 28, 2018	Sep. 30, 2019	Sep. 28, 2018
Polaris Alpha
Business Acquisition [Line Items]
Pro forma revenue		$ 976,157		$ 2,784,864
Pro forma net income including noncontrolling interests		46,848		179,071
OGSystems
Business Acquisition [Line Items]
Pro forma revenue	$ 1,023,277	1,007,793	$ 2,919,379	2,715,572
Pro forma net income including noncontrolling interests	61,293	39,224	118,896	196,905
QRC Technologies
Business Acquisition [Line Items]
Pro forma revenue	1,026,831	987,343	2,938,973	2,657,105
Pro forma net income including noncontrolling interests	$ 65,782	$ 44,944	$ 117,399	$ 212,728

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- Definition

Business acquisition, pro forma net income (loss), including portion attributable to noncontrolling interest.

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
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