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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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