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Basis of Presentation and Significant Accounting Policies - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) entity | Dec. 31, 2020 USD ($) | Jun. 30, 2020 entity
Financing Receivable, Impaired [Line Items] |  |  |
Increase in accounts receivable | $ 54,729,000 |  |
Allowance for credit loss | 0 | $ 0 |
Contract asset retainage | 47,308,000 | 44,412,000 |
Contract liability retainage | $ 46,882,000 | 33,856,000 |
Retainage rate | 65.00% |  |
Decrease in contract asset retainage | $ 1,665,000 |  |
Increase in contract liability retainage | 13,913,000 |  |
Contract liability recognized during the period | $ 472,766,000 |  |
Contract liability revenue recognized |  | 444,213,000 |
Consolidated ownership percentage | 50.00% |  |
Consolidated 50% owned subsidiaries, number of entities | entity | 2 |  | 2
Other Current Assets |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Restricted cash | $ 6,853,000 | $ 6,457,000 |
Minimum | Transportation Solutions |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Revenue recognition, percentage of completion range | 12 months |  |
Minimum | E-Infrastructure Solutions |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Revenue recognition, percentage of completion range | 6 months |  |
Maximum | Transportation Solutions |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Revenue recognition, percentage of completion range | 36 months |  |
Maximum | E-Infrastructure Solutions |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Revenue recognition, percentage of completion range | 24 months |  |
Building and improvements | Minimum |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Building and improvements | Maximum |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Property, plant and equipment, useful life | 39 years |  |
Plant and field equipment | Minimum |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Property, plant and equipment, useful life | 5 years |  |
Plant and field equipment | Maximum |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Property, plant and equipment, useful life | 20 years |  |

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