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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
Company
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]      
Number of operating subsidiaries | Company 100    
Revenues from unrelated entities $ 2,890,432 $ 2,592,549  
Total revenues 2,890,432 2,592,549  
Total assets 5,640,910   $ 5,524,607
Net periodic pension (cost) income (274) 1,169  
Interest expense, net (1,832) (1,289)  
Operating income (loss) 154,910 99,957  
Income before income taxes 152,804 99,837  
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 2,779,562 2,461,052  
Total revenues 2,779,562 2,461,052  
Total assets 4,848,085   4,672,469
Operating income (loss) 179,413 115,847  
United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 644,746 522,030  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,078,558 992,644  
United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 725,375 635,627  
United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 330,883 310,751  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 110,870 131,497  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 645,527 523,010  
Total revenues 645,654 523,414  
Total assets 1,087,933   1,078,405
Operating income (loss) 40,516 19,993  
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,080,036 994,912  
Total revenues 1,099,484 997,030  
Total assets 1,876,261   1,835,001
Operating income (loss) 86,227 58,433  
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 748,610 660,057  
Total assets 1,257,424   1,206,518
Operating income (loss) 37,650 24,163  
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 338,507 324,501  
Total assets 626,467   552,545
Operating income (loss) 15,020 13,258  
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Total revenues 110,870 131,497  
Total assets 273,819   255,547
Operating income (loss) 5,424 10,588  
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Total assets 519,006   $ 596,591
Operating income (loss) (29,927) (26,478)  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (52,693) (43,950)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (781) (980)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ (1,478) $ (2,268)