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Commitments and Contingencies (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 25, 2015 USD ($) | Dec. 31, 2017 USD ($) item | 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 ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Nov. 30, 2012 USD ($) | Nov. 30, 2011 USD ($)
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billings in excess of costs and estimated earnings |  | $ 159,034 |  |  |  | $ 112,606 |  |  |  | $ 159,034 | $ 112,606 |  |  |  |
Revenue |  | 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 |  |  |
Gross Profit |  | 68,477 | $ 70,421 | $ 84,483 | $ 55,053 | 68,616 | 50,129 | 43,285 | $ 39,277 | 278,434 | 201,307 | $ 219,873 |  |  |
Withdrawal liability recorded |  | $ 4,700 |  |  |  | 5,700 |  |  |  | $ 4,700 | 5,700 |  |  | $ 7,600 | $ 7,500
Disputed Receivables. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  |  |  |  |  |  | 17,900 |  |  |  |  |  |  |  |
Receipts related to disputed receivable |  |  |  |  |  |  | 38,000 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 27,500 |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  |  |  | 26,700 | $ 0 |  |  |  |  |  |  |
Construction Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of projects under litigation | item |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |
Construction Project One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  | $ 32,900 |  |  |  |  |  |  |  | $ 32,900 |  |  |  |  |
Billings in excess of costs and estimated earnings |  | 17,900 |  |  |  |  |  |  |  | 17,900 |  |  |  |  |
Construction Project Two | Disputed Receivables. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receipts related to disputed receivable |  |  |  |  |  |  | 38,000 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 27,500 |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  |  |  | $ 26,700 |  |  |  |  |  | $ 0 |  |
JCG | North Texas Tollway Authority v. James Construction Group, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected remediation cost | 22,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining accrual balance |  | $ 15,200 |  |  |  |  |  |  |  | $ 15,200 |  |  |  |  |
Percentage of expected costs second defendant would pay |  | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Percentage of expected costs Company would pay |  | 80.00% |  |  |  |  |  |  |  | 80.00% |  |  |  |  |
Increase in liability |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |
Remediation costs |  |  |  |  |  |  |  |  |  | 3,700 |  |  |  |  |
JCG | North Texas Tollway Authority v. James Construction Group, LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed payments by second defendant in expected remediation costs toward settlement | $ 5,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bid and completion bonds issued and outstanding |  | $ 705,700 |  |  |  | $ 680,000 |  |  |  | $ 705,700 | $ 680,000 |  |  |  |

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