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Reportable Segments (Details) $ in Thousands	3 Months Ended								7 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 ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment reporting information
Number of reportable segments | segment										5
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
% of Total Revenue										100.00%	100.00%	100.00%
Gross Profit	$ 103,253	$ 106,505	$ 71,419	$ 44,560	$ 68,477	$ 70,421	$ 84,483	$ 55,053		$ 325,737	$ 278,434	$ 201,307
% of Revenue										11.10%	11.70%	10.10%
Power
Segment reporting information
Revenue										$ 694,048	$ 606,125	$ 478,653
% of Total Revenue										23.60%	25.50%	24.00%
Gross Profit										$ 109,789	$ 65,675	$ 49,807
% of Revenue										15.80%	10.80%	10.40%
Pipeline
Segment reporting information
Revenue										$ 590,937	$ 465,570	$ 401,931
% of Total Revenue										20.10%	19.50%	20.10%
Gross Profit										$ 66,602	$ 92,087	$ 68,100
% of Revenue										11.30%	19.80%	16.90%
Utilities
Segment reporting information
Revenue										$ 902,772	$ 806,523	$ 637,212
% of Total Revenue										30.70%	33.90%	31.90%
Gross Profit										$ 111,825	$ 113,037	$ 100,071
% of Revenue										12.40%	14.00%	15.70%
Transmission
Segment reporting information
Revenue									$ 286,749	$ 286,749
% of Total Revenue									9.80%
Gross Profit									$ 31,904
% of Revenue									11.10%
Civil
Segment reporting information
Revenue										$ 464,972	$ 501,777	$ 479,152
% of Total Revenue										15.80%	21.10%	24.00%
Gross Profit										$ 5,617	$ 7,635	$ (16,671)
% of Revenue										1.20%	1.50%	(3.50%)

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