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Revenue From Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 401,666 | $ 400,038 | $ 716,982 | $ 696,726
Fixed-Unit Price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 225,886 | 203,692 | 403,434 | 345,431
Lump Sum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 127,416 | 147,460 | 218,571 | 261,712
Residential and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 48,364 | 48,886 | 94,977 | 89,583
Heavy Civil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 203,153 | 220,448 | 350,207 | 376,063
Heavy Civil | Heavy Highway |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 139,189 | 152,526 | 238,705 | 248,900
Heavy Civil | Aviation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 36,754 | 34,867 | 63,976 | 63,324
Heavy Civil | Water Containment and Treatment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16,208 | 16,529 | 30,427 | 38,338
Heavy Civil | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,002 | 16,526 | 17,099 | 25,501
Specialty Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 151,904 | 135,703 | 275,992 | 240,426
Specialty Services | Land Development |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 123,743 | 105,639 | 220,315 | 181,884
Specialty Services | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28,161 | 30,064 | 55,677 | 58,542
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 46,609 | $ 43,887 | $ 90,783 | $ 80,237

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: 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=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: 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=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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