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Concentration of Risk and Enterprise Wide Disclosures - Contract Revenues by Customer (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Contract revenues	$ 1,367,009	$ 1,236,043	$ 1,018,484
E-Infrastructure Solutions
Revenue, Major Customer [Line Items]
Contract receivable	$ 27,188	$ 19,807
Utah Department of Transportation (“UDOT”) | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Contract revenues			$ 135,496
Utah Department of Transportation (“UDOT”) | Customer Concentration Risk | Revenue from Contract with Customer
Revenue, Major Customer [Line Items]
Concentration risk percentage			12.00%
One Customer | Customer Concentration Risk | Contract Receivables | E-Infrastructure Solutions
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.00%	11.00%

X

- Definition

Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

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