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Customer Concentrations (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) customer item	Dec. 31, 2017 USD ($) customer	Dec. 31, 2016 USD ($)
Customer concentrations
Amount	$ 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
Unbilled revenue	249,577				$ 160,092				249,577	160,092
Utilities
Customer concentrations
Amount									902,772	806,523	637,212
Civil
Customer concentrations
Amount									464,972	501,777	479,152
Pipeline
Customer concentrations
Amount									590,937	465,570	401,931
Power
Customer concentrations
Amount									694,048	606,125	478,653
Utility Company under Chapter 11
Customer concentrations
Unbilled revenue	$ 36,000								36,000
Revenues | Customer concentration
Customer concentrations
Amount									$ 1,038,378	$ 912,725	$ 910,007
Percentage									35.30%	38.40%	45.60%
Revenues | Customer concentration | Public gas and electric utility | Utilities/Power
Customer concentrations
Amount									$ 250,286	$ 210,747	$ 184,002
Percentage									8.50%	8.90%	9.20%
Revenues | Customer concentration | Private gas and electric utility | Utilities
Customer concentrations
Amount									$ 232,162	$ 190,659	$ 201,443
Percentage									7.90%	8.00%	10.10%
Revenues | Customer concentration | State DOT | Civil
Customer concentrations
Amount									$ 202,452	$ 222,142	$ 193,049
Percentage									6.90%	9.30%	9.70%
Revenues | Customer concentration | Pipeline Operator | Pipeline
Customer concentrations
Amount									$ 198,198
Percentage									6.70%
Revenues | Customer concentration | Pipeline Operator | Maximum | Pipeline
Customer concentrations
Percentage										5.00%	5.00%
Revenues | Customer concentration | Pipeline Operator | Pipeline/Power
Customer concentrations
Amount									$ 155,280
Percentage									5.30%		5.00%
Revenues | Customer concentration | Pipeline Operator | Maximum | Pipeline/Power
Customer concentrations
Percentage										5.00%
Revenues | Customer concentration | Chemical/Energy Producer | Power/Civil
Customer concentrations
Amount										$ 160,995	$ 208,458
Percentage										6.80%	10.40%
Revenues | Customer concentration | Chemical/Energy Producer | Maximum | Power/Civil
Customer concentrations
Percentage									5.00%
Revenues | Customer concentration | Pipeline Operator | Pipeline
Customer concentrations
Amount										$ 128,182
Revenues | Customer concentration | Pipeline Operator | Maximum | Pipeline
Customer concentrations
Percentage									5.00%	5.40%	5.00%
Revenues | Customer concentration | Pipeline Operator | Pipeline
Customer concentrations
Amount											$ 123,055
Percentage											6.20%
Revenues | Customer concentration | Pipeline Operator | Maximum | Pipeline
Customer concentrations
Percentage									5.00%	5.00%
Revenues | Customer concentration | Utility Company under Chapter 11
Customer concentrations
Percentage									8.50%
Revenues | Customer concentration | Top ten customers
Customer concentrations
Percentage									52.20%	56.40%	60.40%
Number of top customers | customer									10
Number of calendar years in which top customers typically generate minimum specified percentage of revenue | item									1
Minimum percentage of revenues generated by top ten customers									50.00%
Revenues | Customer concentration | One customer
Customer concentrations
Percentage									5.30%	8.90%
Accounts receivable | Customer concentration | Utility Company under Chapter 11
Customer concentrations
Percentage									1.90%
Accounts receivable | Customer concentration | One customer
Customer concentrations
Percentage									9.30%	4.30%
Number of customers | customer									1	1

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