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v3.20.1

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Contract receivables | $ 73,400,000 | $ 79,400,000
Allowance for doubtful accounts against contracts receivable | $ 0 | 0
Ownership interest in subsidiaries | 50.00% |
Other current assets |  |
Property, Plant and Equipment [Line Items] |  |
Restricted cash, current | $ 4,700,000 | $ 4,800,000
Heavy Civil | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Percentage of completion range | 12 months |
Heavy Civil | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Percentage of completion range | 36 months |
Specialty Services | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Percentage of completion range | 6 months |
Specialty Services | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Percentage of completion range | 24 months |
Building and Building Improvements | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment useful life | 5 years |
Building and Building Improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment useful life | 39 years |
Equipment | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment useful life | 5 years |
Equipment | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment useful life | 20 years |

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