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Revenue From Contracts With Customers - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) contract | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Remaining performance obligation | $ | $ 885 |
Remaining performance obligation expected to be recognize the remainder of 2018 | 61.00% |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognition, contract term | 12 months |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Revenue recognition, contract term | 36 months |
Transferred over Time | Product Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 84.00% | 100.00%
Transferred at Point in Time | Product Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation of Revenue [Line Items] |  |
Concentration risk, percentage | 16.00% | 0.00%
Heavy Civil Construction |  |
Disaggregation of Revenue [Line Items] |  |
Number of contracts | contract | 150 |

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