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Concentration of Risk and Enterprise Wide Disclosures - Contract Revenues by Customer (Details) - USD ($) $ in Thousands | 12 Months Ended
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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% |

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