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Acquisitions - Schedule of Supplemental Pro Forma Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Pro forma Revenue	$ 957,498	$ 1,017,325	$ 2,748,559	$ 2,988,153
Pro forma Net Income including noncontrolling interests	31,070	45,195	56,694	82,921
Braxton Science & Technology Group
Business Acquisition [Line Items]
Pro forma Revenue	956,050	1,046,002	2,710,103	3,050,708
Pro forma Net Income including noncontrolling interests	$ 27,463	$ 48,072	$ 55,391	$ 93,672

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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
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