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v3.20.1

Revenue - Disaggregation of revenue by customer type and contract type (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue |  |
Revenue | $ 743,243 | $ 661,558
Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 217,779 | 146,285
Unit price |  |
Disaggregation of Revenue |  |
Revenue | 326,886 | 259,200
Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 198,578 | 256,073
MSA |  |
Disaggregation of Revenue |  |
Revenue | 270,408 | 292,879
Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | 472,835 | 368,679
Power |  |
Disaggregation of Revenue |  |
Revenue | 196,193 | 145,383
Power | Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 144,850 | 75,143
Power | Unit price |  |
Disaggregation of Revenue |  |
Revenue | 181 | 6,613
Power | Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 51,162 | 63,627
Power | MSA |  |
Disaggregation of Revenue |  |
Revenue | 37,095 | 49,195
Power | Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | 159,098 | 96,188
Pipeline |  |
Disaggregation of Revenue |  |
Revenue | 191,523 | 134,814
Pipeline | Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 15,345 | 17,227
Pipeline | Unit price |  |
Disaggregation of Revenue |  |
Revenue | 81,830 | 374
Pipeline | Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 94,348 | 117,213
Pipeline | MSA |  |
Disaggregation of Revenue |  |
Revenue | 46,732 | 21,849
Pipeline | Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | 144,791 | 112,965
Utilities |  |
Disaggregation of Revenue |  |
Revenue | 147,170 | 146,206
Utilities | Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 24,089 | 22,767
Utilities | Unit price |  |
Disaggregation of Revenue |  |
Revenue | 80,639 | 67,878
Utilities | Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 42,442 | 55,561
Utilities | MSA |  |
Disaggregation of Revenue |  |
Revenue | 104,011 | 119,462
Utilities | Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | 43,159 | 26,744
Transmission |  |
Disaggregation of Revenue |  |
Revenue | 102,784 | 118,443
Transmission | Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 13,636 | 8,463
Transmission | Unit price |  |
Disaggregation of Revenue |  |
Revenue | 88,789 | 105,841
Transmission | Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 359 | 4,139
Transmission | MSA |  |
Disaggregation of Revenue |  |
Revenue | 81,774 | 101,723
Transmission | Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | 21,010 | 16,720
Civil |  |
Disaggregation of Revenue |  |
Revenue | 105,573 | 116,712
Civil | Fixed price |  |
Disaggregation of Revenue |  |
Revenue | 19,859 | 22,685
Civil | Unit price |  |
Disaggregation of Revenue |  |
Revenue | 75,447 | 78,494
Civil | Cost reimbursable |  |
Disaggregation of Revenue |  |
Revenue | 10,267 | 15,533
Civil | MSA |  |
Disaggregation of Revenue |  |
Revenue | 796 | 650
Civil | Non-MSA |  |
Disaggregation of Revenue |  |
Revenue | $ 104,777 | $ 116,062

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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