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Commitments and Contingencies - Legal (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 25, 2015 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2012 | Nov. 30, 2011
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 877,670 | $ 908,902 | $ 648,787 | $ 504,119 | $ 579,017 | $ 608,311 | $ 631,165 | $ 561,502 |  | $ 2,939,478 | $ 2,379,995 | $ 1,996,948 |  |
Gross profit |  | $ 103,253 | $ 106,505 | $ 71,419 | $ 44,560 | 68,477 | $ 70,421 | $ 84,483 | $ 55,053 |  | 325,737 | 278,434 | 201,307 |  |
Disputed Receivables. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  |  |  |  |  |  |  |  |  | $ 17,900 |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 27,500 | 18,100 |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | 26,700 | 17,400 |  |  |  |
Receipts related to disputed receivable |  |  |  |  |  |  |  |  |  | 38,000 |  |  |  |  |
Construction Project One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable recorded relating to the project |  |  |  |  |  | 32,900 |  |  |  |  |  | 32,900 |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 18,100 |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  | 17,400 |  |  |  |
Reserve |  |  |  |  |  | 17,900 |  |  |  |  |  | 17,900 |  |  |
Receipts related to disputed receivable |  |  |  |  |  |  |  |  |  |  | $ 32,900 |  |  |  |
Construction Project Two | Disputed Receivables. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  | $ 26,700 |  |  |  |  |
Receipts related to disputed receivable |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000 |  |
JCG | North Texas Tollway Authority v. James Construction Group, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected remediation cost on settlement | $ 17,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of expected costs second defendant would pay |  | 20.00% |  |  |  |  |  |  |  |  | 20.00% |  |  |  |
Percentage of expected costs Company would pay |  | 80.00% |  |  |  |  |  |  |  |  | 80.00% |  |  |  |
Remaining accrual balance |  | $ 18,500 |  |  |  |  |  |  |  |  | $ 18,500 |  |  |  |
Expected remediation cost | 22,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in liability |  |  |  |  |  |  |  |  |  |  | 3,800 |  |  |  |
Remediation costs |  |  |  |  |  |  |  |  |  |  |  | 4,200 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withdrawal liability for multiemployer pension plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Withdrawal liability recorded |  |  |  |  |  | 4,700 |  |  |  |  |  | 4,700 |  | $ 7,600 | $ 7,500
Bonding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bid and completion bonds issued and outstanding |  | $ 554,900 |  |  |  | $ 705,700 |  |  |  |  | $ 554,900 | $ 705,700 |  |  |

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