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Segment Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Company
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]      
Number of operating subsidiaries | Company 100    
Revenues from unrelated entities $ 14,566,116 $ 12,582,873 $ 11,076,120
Total revenues 14,566,116 12,582,873 11,076,120
Operating income (loss) 1,344,863 875,756 564,877
Impairment loss on long-lived assets 0 (2,350) 0
Net periodic pension income (cost) 894 (1,119) 4,311
Interest expense (3,779) (17,199) (13,199)
Interest income 35,404 15,415 2,761
Income before income taxes 1,377,382 872,853 558,750
Cost of sales 11,801,065 10,493,534 9,472,526
Selling, general and administrative expenses 1,420,188 1,211,233 1,038,717
Depreciation and amortization of property, plant, and equipment 56,678 51,822 47,296
Amortization of identifiable intangible assets 77,002 67,143 61,315
Capital expenditures 74,950 78,404 49,289
Total assets 7,716,473 6,609,721 5,524,607
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 14,140,591 12,146,450 10,599,042
Total revenues 14,140,591 12,146,450 10,599,042
Operating income (loss) 1,467,732 979,654 645,479
Cost of sales 11,424,642 10,114,467 9,054,986
Selling, general and administrative expenses 1,248,218 1,052,329 898,577
Depreciation and amortization of property, plant, and equipment 52,042 47,723 42,887
Amortization of identifiable intangible assets 77,002 67,143 61,315
Capital expenditures 68,179 74,748 46,366
Total assets 5,976,858 5,440,862 4,672,469
UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,342,927 2,783,723 2,433,114
UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 6,405,657 5,074,803 4,292,208
UNITED STATES | United States Building Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,114,817 3,120,134 2,754,953
UNITED STATES | United States Industrial Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 1,277,190 1,167,790 1,118,767
UNITED KINGDOM | United Kingdom Building Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 425,525 436,423 477,078
Operating Segments [Member] | UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 3,349,115 2,786,007 2,437,304
Total revenues 3,370,506 2,786,895 2,438,916
Operating income (loss) 447,186 230,640 148,728
Cost of sales 2,673,491 2,359,816 2,129,405
Selling, general and administrative expenses 222,250 193,267 154,981
Depreciation and amortization of property, plant, and equipment 7,928 8,402 7,543
Amortization of identifiable intangible assets 6,773 9,583 7,298
Capital expenditures 9,467 6,929 11,228
Total assets 1,314,577 1,243,707 1,078,405
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 6,411,887 5,083,903 4,303,090
Total revenues 6,458,776 5,134,686 4,338,584
Operating income (loss) 799,613 530,644 330,325
Cost of sales 5,147,903 4,188,707 3,666,428
Selling, general and administrative expenses 458,141 355,452 295,455
Depreciation and amortization of property, plant, and equipment 16,133 12,503 11,492
Amortization of identifiable intangible assets 25,320 15,302 14,955
Capital expenditures 31,057 37,543 11,930
Total assets 2,659,184 2,242,833 1,835,001
Operating Segments [Member] | UNITED STATES | United States Building Services      
Segment Reporting Information [Line Items]      
Total revenues 3,166,680 3,228,056 2,856,115
Operating income (loss) 176,720 182,995 146,639
Cost of sales 2,516,745 2,567,993 2,286,526
Selling, general and administrative expenses 421,353 369,146 321,788
Depreciation and amortization of property, plant, and equipment 15,716 15,672 12,964
Amortization of identifiable intangible assets 21,606 19,621 16,008
Capital expenditures 18,314 19,843 13,303
Total assets 1,396,236 1,382,664 1,206,518
Operating Segments [Member] | UNITED STATES | United States Industrial Services      
Segment Reporting Information [Line Items]      
Total revenues 1,284,327 1,179,321 1,175,469
Operating income (loss) 44,213 35,375 19,787
Cost of sales 1,086,503 997,951 972,627
Selling, general and administrative expenses 146,474 134,464 126,353
Depreciation and amortization of property, plant, and equipment 12,265 11,146 10,888
Amortization of identifiable intangible assets 23,303 22,637 23,054
Capital expenditures 9,341 10,433 9,905
Total assets 606,861 571,658 552,545
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services      
Segment Reporting Information [Line Items]      
Total revenues 425,525 436,423 477,078
Operating income (loss) 21,485 25,681 29,838
Cost of sales 376,423 379,067 417,540
Selling, general and administrative expenses 27,616 31,675 29,700
Depreciation and amortization of property, plant, and equipment 3,750 3,116 2,752
Amortization of identifiable intangible assets 0 0 0
Capital expenditures 5,643 1,984 2,816
Total assets 283,897 277,066 255,547
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Segment Reporting Information [Line Items]      
Operating income (loss) (144,354) (127,229) (110,440)
Selling, general and administrative expenses 144,354 127,229 110,440
Depreciation and amortization of property, plant, and equipment 886 983 1,657
Capital expenditures 1,128 1,672 107
Total assets 1,455,718 891,793 596,591
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (139,698) (182,508) (210,042)
Intersegment Eliminations [Member] | UNITED STATES | United States Electrical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (6,188) (2,284) (4,190)
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ (6,230) $ (9,100) $ (10,882)