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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Company
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting Information [Line Items]      
Number of operating subsidiaries | Company 100    
Revenues from unrelated entities $ 3,432,276 $ 2,890,432  
Total revenues 3,432,276 2,890,432  
Operating income (loss) 259,953 154,910  
Net periodic pension income (cost) 222 (274)  
Interest income (expense), net 7,541 (1,832)  
Income before income taxes 267,716 152,804  
Total assets 6,687,327   $ 6,609,721
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,327,589 2,779,562  
Total revenues 3,327,589 2,779,562  
Operating income (loss) 293,734 179,413  
Total assets 5,441,827   5,440,862
United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 764,711 644,746  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,427,665 1,078,558  
United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 781,160 725,375  
United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 354,053 330,883  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 104,687 110,870  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 765,202 645,527  
Total revenues 766,739 645,654  
Operating income (loss) 91,589 40,516  
Total assets 1,218,422   1,243,707
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,428,981 1,080,036  
Total revenues 1,436,828 1,099,484  
Operating income (loss) 150,720 86,227  
Total assets 2,258,381   2,242,833
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 803,873 748,610  
Operating income (loss) 33,459 37,650  
Total assets 1,372,560   1,382,664
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 358,175 338,507  
Operating income (loss) 17,966 15,020  
Total assets 592,464   571,658
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Total revenues 104,687 110,870  
Operating income (loss) 5,377 5,424  
Total assets 278,147   277,066
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) (39,158) (29,927)  
Total assets 967,353   $ 891,793
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (38,026) (52,693)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (491) (781)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ (1,316) $ (1,478)