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Revenue - Disaggregation of revenue by customer type and contract type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue
Revenue	$ 1,890,745	$ 1,563,715	$ 3,538,858	$ 2,976,422
Fixed Price
Disaggregation of Revenue
Revenue	977,815	602,441	1,813,568	1,271,792
Unit Price
Disaggregation of Revenue
Revenue	584,334	552,568	1,072,415	991,029
Cost Reimbursable
Disaggregation of Revenue
Revenue	328,596	408,706	652,875	713,601
MSA
Disaggregation of Revenue
Revenue	602,989	574,366	1,092,941	1,048,436
Non-MSA
Disaggregation of Revenue
Revenue	1,287,756	989,349	2,445,917	1,927,986
Intersegment eliminations
Disaggregation of Revenue
Revenue	(39,083)	(30,575)	(62,719)	(53,370)
Intersegment eliminations | Fixed Price
Disaggregation of Revenue
Revenue	(32,125)	(30,536)	(51,252)	(51,485)
Intersegment eliminations | Unit Price
Disaggregation of Revenue
Revenue	(6,444)	(12)	(9,906)	(1,765)
Intersegment eliminations | Cost Reimbursable
Disaggregation of Revenue
Revenue	(514)	(27)	(1,561)	(120)
Intersegment eliminations | MSA
Disaggregation of Revenue
Revenue	(387)	(44)	(928)	(238)
Intersegment eliminations | Non-MSA
Disaggregation of Revenue
Revenue	(38,696)	(30,531)	(61,791)	(53,132)
Utilities | Operating Segment
Disaggregation of Revenue
Revenue	693,021	620,798	1,256,428	1,108,722
Utilities | Operating Segment | Fixed Price
Disaggregation of Revenue
Revenue	110,536	93,571	188,466	180,571
Utilities | Operating Segment | Unit Price
Disaggregation of Revenue
Revenue	443,781	387,980	788,152	685,405
Utilities | Operating Segment | Cost Reimbursable
Disaggregation of Revenue
Revenue	138,704	139,247	279,810	242,746
Utilities | Operating Segment | MSA
Disaggregation of Revenue
Revenue	539,458	496,458	991,541	877,956
Utilities | Operating Segment | Non-MSA
Disaggregation of Revenue
Revenue	153,563	124,340	264,887	230,766
Utilities | Intersegment eliminations
Disaggregation of Revenue
Revenue	39,100	30,600	62,700	53,400
Energy | Operating Segment
Disaggregation of Revenue
Revenue	1,236,807	973,492	2,345,149	1,921,070
Energy | Operating Segment | Fixed Price
Disaggregation of Revenue
Revenue	899,404	539,406	1,676,354	1,142,706
Energy | Operating Segment | Unit Price
Disaggregation of Revenue
Revenue	146,997	164,600	294,169	307,389
Energy | Operating Segment | Cost Reimbursable
Disaggregation of Revenue
Revenue	190,406	269,486	374,626	470,975
Energy | Operating Segment | MSA
Disaggregation of Revenue
Revenue	63,918	77,952	102,328	170,718
Energy | Operating Segment | Non-MSA
Disaggregation of Revenue
Revenue	$ 1,172,889	$ 895,540	$ 2,242,821	$ 1,750,352

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