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Summary of Significant Accounting Policies - Foreign Operations (Details) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2018 USD ($) item $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares
Foreign operations
Assets	$ 1,594,147				$ 1,255,740					$ 1,594,147	$ 1,255,740
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
Income (loss) before tax of Canadian operations										2,356	(272)	774
Cash concentration
Cash and cash equivalents	151,063				170,385					$ 151,063	170,385
Collective bargaining agreements
Percentage of labor force subject to collective bargaining agreements										46.70%
Number of collective bargaining agreements | item										111
Number of collective bargaining agreements requiring renegotiation during the year | item										93
Number of years without work stoppages										20 years
Insurance
Self- insurance amount per claim										$ 250	250
Self-insurance reserve	42,800				29,400					42,800	29,400
Accounts receivable
Allowance for doubtful accounts	1,700				500					1,700	500
Estimated net impact of change in estimate
Revised estimates in current year that impact prior period	(16,242)				6,435					(16,242)	6,435	1,685
Revised estimates in current year that impact prior period					16,242						16,242	(6,435)
Net impact to gross margin	$ (16,242)				$ 22,677					$ (16,242)	$ 22,677	$ (4,750)
EPS impact to year | $ / shares	$ (0.16)				$ 0.24					$ (0.16)	$ 0.24	$ (0.05)
Gross profit	$ 103,253	$ 106,505	$ 71,419	$ 44,560	$ 68,477	$ 70,421	$ 84,483	$ 55,053		$ 325,737	$ 278,434	$ 201,307
Texas Heavy Civil Business unit | JCG | East
Estimated net impact of change in estimate
Charge against income									$ 37,300
Disputed Receivables.
Foreign operations
Revenue									27,500	18,100
Estimated net impact of change in estimate
Receivable related to a dispute with a customer									17,900
Receipts related to disputed receivable									38,000
Gross profit									$ 26,700	17,400
Canada
Foreign operations
Assets	$ 45,100				$ 12,700					45,100	12,700
Revenue										86,400	8,300	11,200
Income (loss) before tax of Canadian operations										$ 2,400	$ (300)	$ 800

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