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Customer Concentrations (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) customer item | Dec. 31, 2016 USD ($) customer | Dec. 31, 2015 USD ($)
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount | $ 579,017 | $ 608,311 | $ 631,165 | $ 561,502 | $ 601,863 | $ 507,828 | $ 456,811 | $ 430,446 | $ 2,379,995 | $ 1,996,948 | $ 1,929,415
Civil |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | 501,777 | 479,152 | 576,711
Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | 465,570 | 401,931 | 299,365
Power |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | 606,125 | 478,653 | 466,292
Utilities |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | 806,523 | 637,212 | 587,047
Revenues. | Customer concentration |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 912,725 | $ 910,007 | $ 944,223
Percentage |  |  |  |  |  |  |  |  | 38.40% | 45.60% | 48.90%
Revenues. | Customer concentration | State DOT | Civil |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 222,142 | $ 193,049 | $ 183,847
Percentage |  |  |  |  |  |  |  |  | 9.30% | 9.70% | 9.50%
Revenues. | Customer concentration | Public gas and electric utility | Utilities |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 210,747 | $ 184,002 | $ 120,507
Percentage |  |  |  |  |  |  |  |  | 8.90% | 9.20% | 6.20%
Revenues. | Customer concentration | Private gas and electric utility | Utilities |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 190,659 | $ 201,443 | $ 173,232
Percentage |  |  |  |  |  |  |  |  | 8.00% | 10.10% | 9.00%
Revenues. | Customer concentration | Chemical/Energy Producer | Power/Civil |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 160,995 | $ 208,458 | $ 173,931
Percentage |  |  |  |  |  |  |  |  | 6.80% | 10.40% | 9.00%
Revenues. | Customer concentration | Pipeline Operator | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  | $ 128,182 |  |
Percentage |  |  |  |  |  |  |  |  | 5.40% |  |
Revenues. | Customer concentration | Pipeline Operator | Maximum | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  |  | 5.00% | 5.00%
Revenues. | Customer concentration | Pipeline Operator | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  |  | $ 123,055 |
Percentage |  |  |  |  |  |  |  |  |  | 6.20% |
Revenues. | Customer concentration | Pipeline Operator | Maximum | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 5.00% |  | 5.00%
Revenues. | Customer concentration | Pipeline Operator | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  |  |  | $ 165,578
Percentage |  |  |  |  |  |  |  |  |  |  | 8.60%
Revenues. | Customer concentration | Pipeline Operator | Maximum | Pipeline |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 5.00% | 5.00% |
Revenues. | Customer concentration | Gas utility | Utilities |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Amount |  |  |  |  |  |  |  |  |  |  | $ 127,128
Percentage |  |  |  |  |  |  |  |  |  |  | 6.60%
Revenues. | Customer concentration | Gas utility | Maximum | Utilities |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 5.00% | 5.00% |
Revenues. | Customer concentration | Top ten customers |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Number of calendar years in which top customers typically generate minimum specified percentage of revenue | item |  |  |  |  |  |  |  |  | 1 |  |
Minimum percentage of revenues generated by top ten customers |  |  |  |  |  |  |  |  | 50.00% |  |
Percentage |  |  |  |  |  |  |  |  | 56.40% | 60.40% | 59.40%
Number of top customers | customer |  |  |  |  |  |  |  |  | 10 |  |
Revenues. | Customer concentration | One customer |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 8.90% | 6.20% |
Accounts receivable | Customer concentration | One customer |  |  |  |  |  |  |  |  |  |  |
Customer concentrations |  |  |  |  |  |  |  |  |  |  |
Percentage |  |  |  |  |  |  |  |  | 4.30% | 20.80% |
Number of customers | customer |  |  |  |  |  |  |  |  | 1 | 1 |

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