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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
Company
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information [Line Items]      
Number of operating subsidiaries | Company 100    
Revenues from unrelated entities $ 3,867,372 $ 3,432,276  
Total revenues 3,867,372 3,432,276  
Operating income (loss) 318,756 259,953  
Net periodic pension income 54 222  
Interest income, net 5,387 7,541  
Income before income taxes 324,197 267,716  
Cost of sales 3,144,654 2,842,967  
Selling, general and administrative expenses 403,962 329,356  
Depreciation and amortization of property, plant, and equipment 15,582 13,337  
Amortization of identifiable intangible assets 26,363 16,251  
Capital expenditures 26,131 20,278  
Total assets 8,078,872   $ 7,716,473
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,762,071 3,327,589  
Total revenues 3,762,071 3,327,589  
Operating income (loss) 365,987 293,734  
Cost of sales 3,051,557 2,750,650  
Selling, general and administrative expenses 344,527 283,205  
Depreciation and amortization of property, plant, and equipment 14,401 12,198  
Amortization of identifiable intangible assets 26,363 16,251  
Capital expenditures 22,249 16,509  
Total assets 7,107,484   5,976,858
United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,087,844 764,711  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,572,602 1,427,665  
United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 742,623 781,160  
United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 359,002 354,053  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 105,301 104,687  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,089,950 765,202  
Total revenues 1,114,195 766,739  
Operating income (loss) 136,057 91,589  
Cost of sales 876,243 626,869  
Selling, general and administrative expenses 75,544 46,253  
Depreciation and amortization of property, plant, and equipment 2,305 1,961  
Amortization of identifiable intangible assets 9,480 1,812  
Capital expenditures 4,622 1,068  
Total assets 2,437,083   1,314,577
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,573,621 1,428,981  
Total revenues 1,585,114 1,436,828  
Operating income (loss) 186,747 150,720  
Cost of sales 1,265,710 1,179,405  
Selling, general and administrative expenses 120,145 97,540  
Depreciation and amortization of property, plant, and equipment 4,876 3,478  
Amortization of identifiable intangible assets 5,397 3,828  
Capital expenditures 10,979 7,395  
Total assets 2,617,568   2,659,184
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 751,884 803,873  
Operating income (loss) 36,423 33,459  
Cost of sales 601,509 644,310  
Selling, general and administrative expenses 104,691 103,391  
Depreciation and amortization of property, plant, and equipment 4,041 3,927  
Amortization of identifiable intangible assets 5,565 4,976  
Capital expenditures 3,343 5,048  
Total assets 1,404,624   1,396,236
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 364,332 358,175  
Operating income (loss) 6,760 17,966  
Cost of sales 308,095 300,066  
Selling, general and administrative expenses 44,147 36,021  
Depreciation and amortization of property, plant, and equipment 3,179 2,832  
Amortization of identifiable intangible assets 5,921 5,635  
Capital expenditures 3,305 2,998  
Total assets 648,209   606,861
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Total revenues 105,301 104,687  
Operating income (loss) 4,987 5,377  
Cost of sales 93,097 92,317  
Selling, general and administrative expenses 7,217 6,993  
Depreciation and amortization of property, plant, and equipment 932 893  
Amortization of identifiable intangible assets 0 0  
Capital expenditures 2,456 1,945  
Total assets 299,103   283,897
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) (52,218) (39,158)  
Selling, general and administrative expenses 52,218 39,158  
Depreciation and amortization of property, plant, and equipment 249 246  
Capital expenditures 1,426 1,824  
Total assets 672,285   $ 1,455,718
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (53,454) (38,026)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (2,106) (491)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ (1,019) $ (1,316)