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Revenue - Disaggregation of revenue by customer type and contract type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue
Revenue	$ 784,384	$ 818,329
Fixed price
Disaggregation of Revenue
Revenue	305,690	328,907
Unit price
Disaggregation of Revenue
Revenue	325,546	309,151
Cost reimbursable
Disaggregation of Revenue
Revenue	153,148	180,271
MSA
Disaggregation of Revenue
Revenue	349,295	338,263
Non-MSA
Disaggregation of Revenue
Revenue	435,089	480,066
Utilities
Disaggregation of Revenue
Revenue	358,728	335,012
Utilities | Fixed price
Disaggregation of Revenue
Revenue	31,517	27,516
Utilities | Unit price
Disaggregation of Revenue
Revenue	242,309	229,743
Utilities | Cost reimbursable
Disaggregation of Revenue
Revenue	84,902	77,753
Utilities | MSA
Disaggregation of Revenue
Revenue	290,366	277,967
Utilities | Non-MSA
Disaggregation of Revenue
Revenue	68,362	57,045
Energy/Renewables
Disaggregation of Revenue
Revenue	359,050	352,864
Energy/Renewables | Fixed price
Disaggregation of Revenue
Revenue	219,021	188,234
Energy/Renewables | Unit price
Disaggregation of Revenue
Revenue	82,572	78,743
Energy/Renewables | Cost reimbursable
Disaggregation of Revenue
Revenue	57,457	85,887
Energy/Renewables | MSA
Disaggregation of Revenue
Revenue	45,234	42,586
Energy/Renewables | Non-MSA
Disaggregation of Revenue
Revenue	313,816	310,278
Pipeline
Disaggregation of Revenue
Revenue	66,606	130,453
Pipeline | Fixed price
Disaggregation of Revenue
Revenue	55,152	113,157
Pipeline | Unit price
Disaggregation of Revenue
Revenue	665	665
Pipeline | Cost reimbursable
Disaggregation of Revenue
Revenue	10,789	16,631
Pipeline | MSA
Disaggregation of Revenue
Revenue	13,695	17,710
Pipeline | Non-MSA
Disaggregation of Revenue
Revenue	$ 52,911	$ 112,743

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No definition available.

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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