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Revenue - Disaggregation of revenue by customer type and contract type (Details) - USD ($) $ in Thousands	3 Months Ended								7 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue
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
Fixed price
Disaggregation of Revenue
Revenue										803,800
Unit price
Disaggregation of Revenue
Revenue										1,139,699
Cost reimbursable
Disaggregation of Revenue
Revenue										995,979
MSA
Disaggregation of Revenue
Revenue										1,128,562
Non-MSA
Disaggregation of Revenue
Revenue										1,810,916
Power
Disaggregation of Revenue
Revenue										694,048	606,125	478,653
Power | Fixed price
Disaggregation of Revenue
Revenue										393,555
Power | Unit price
Disaggregation of Revenue
Revenue										45,339
Power | Cost reimbursable
Disaggregation of Revenue
Revenue										255,154
Power | MSA
Disaggregation of Revenue
Revenue										141,193
Power | Non-MSA
Disaggregation of Revenue
Revenue										552,855
Pipeline
Disaggregation of Revenue
Revenue										590,937	465,570	401,931
Pipeline | Fixed price
Disaggregation of Revenue
Revenue										107,519
Pipeline | Unit price
Disaggregation of Revenue
Revenue										58,651
Pipeline | Cost reimbursable
Disaggregation of Revenue
Revenue										424,767
Pipeline | MSA
Disaggregation of Revenue
Revenue										47,143
Pipeline | Non-MSA
Disaggregation of Revenue
Revenue										543,794
Utilities
Disaggregation of Revenue
Revenue										902,772	806,523	637,212
Utilities | Fixed price
Disaggregation of Revenue
Revenue										184,649
Utilities | Unit price
Disaggregation of Revenue
Revenue										460,122
Utilities | Cost reimbursable
Disaggregation of Revenue
Revenue										258,001
Utilities | MSA
Disaggregation of Revenue
Revenue										699,998
Utilities | Non-MSA
Disaggregation of Revenue
Revenue										202,774
Transmission
Disaggregation of Revenue
Revenue									$ 286,749	286,749
Transmission | Fixed price
Disaggregation of Revenue
Revenue										48,679
Transmission | Unit price
Disaggregation of Revenue
Revenue										230,077
Transmission | Cost reimbursable
Disaggregation of Revenue
Revenue										7,993
Transmission | MSA
Disaggregation of Revenue
Revenue										240,228
Transmission | Non-MSA
Disaggregation of Revenue
Revenue										46,521
Civil
Disaggregation of Revenue
Revenue										464,972	$ 501,777	$ 479,152
Civil | Fixed price
Disaggregation of Revenue
Revenue										69,398
Civil | Unit price
Disaggregation of Revenue
Revenue										345,510
Civil | Cost reimbursable
Disaggregation of Revenue
Revenue										50,064
Civil | Non-MSA
Disaggregation of Revenue
Revenue										$ 464,972

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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