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Revenue From Contracts With Customers - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) contract | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligation | $ 808,740 |  |
Heavy Civil Construction |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Number of contracts (more than) | contract | 150 |  |
Costs and Estimated Earnings in Excess of Billings |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contracts receivable unpaid project contract price | $ 9,300 |  | $ 9,300
Operating income (Loss) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Estimated construction gain (loss) before tax | $ (200) | $ 1,300 |
Transferred over Time | Product Concentration Risk | Revenue from Contract with Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage | 81.00% | 84.00% |
Transferred at Point in Time | Product Concentration Risk | Revenue from Contract with Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage | 19.00% | 16.00% |
Minimum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognition, contract term | 12 months |  |
Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognition, contract term | 36 months |  |

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