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Segment Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Company | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 12,582,873 | $ 11,076,120 | $ 9,903,580
Total revenues | 12,582,873 | 11,076,120 | 9,903,580
Operating income (loss) | 875,756 | 564,877 | 530,800
Impairment loss on long-lived assets | (2,350) | 0 | 0
Net periodic pension (cost) income | (1,119) | 4,311 | 3,625
Interest expense | (17,199) | (13,199) | (6,071)
Interest income | 15,415 | 2,761 | 949
Income before income taxes | 872,853 | 558,750 | 529,303
Capital expenditures | 78,404 | 49,289 | 36,192
Depreciation and amortization of property, plant, and equipment | 51,822 | 47,296 | 48,347
Contract assets | 269,885 | 273,176 | 230,143
Contract liabilities | 1,595,109 | 1,098,263 | 788,134
Total assets | $ 6,609,721 | 5,524,607 | 5,441,446
Number of operating subsidiaries | Company | 100 |  |
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 12,146,450 | 10,599,042 | 9,393,629
Total revenues | 12,146,450 | 10,599,042 | 9,393,629
Operating income (loss) | 979,654 | 645,479 | 604,833
Capital expenditures | 74,748 | 46,366 | 32,791
Depreciation and amortization of property, plant, and equipment | 47,723 | 42,887 | 42,396
Contract assets | 249,712 | 242,656 | 199,294
Contract liabilities | 1,565,599 | 1,068,181 | 754,298
Total assets | 5,440,862 | 4,672,469 | 4,206,824
UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 2,783,723 | 2,433,114 | 2,029,893
UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 5,074,803 | 4,292,208 | 3,922,200
UNITED STATES | United States Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 3,120,134 | 2,754,953 | 2,455,129
UNITED STATES | United States Industrial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 1,167,790 | 1,118,767 | 986,407
UNITED KINGDOM | United Kingdom Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 436,423 | 477,078 | 509,951
Operating Segments [Member] | UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 2,786,007 | 2,437,304 | 2,033,168
Total revenues | 2,786,895 | 2,438,916 | 2,033,863
Operating income (loss) | 230,640 | 148,728 | 169,355
Capital expenditures | 6,929 | 11,228 | 4,985
Depreciation and amortization of property, plant, and equipment | 8,402 | 7,543 | 7,229
Contract assets | 73,464 | 75,603 | 48,382
Contract liabilities | 399,550 | 271,161 | 200,966
Total assets | 1,243,707 | 1,078,405 | 855,417
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 5,083,903 | 4,303,090 | 3,929,035
Total revenues | 5,134,686 | 4,338,584 | 3,935,737
Operating income (loss) | 530,644 | 330,325 | 312,809
Capital expenditures | 37,543 | 11,930 | 10,108
Depreciation and amortization of property, plant, and equipment | 12,503 | 11,492 | 11,354
Contract assets | 97,252 | 99,632 | 89,102
Contract liabilities | 925,481 | 594,453 | 386,518
Total assets | 2,242,833 | 1,835,001 | 1,664,822
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 3,228,056 | 2,856,115 | 2,553,566
Operating income (loss) | 182,995 | 146,639 | 124,335
Capital expenditures | 19,843 | 13,303 | 11,539
Depreciation and amortization of property, plant, and equipment | 15,672 | 12,964 | 12,090
Contract assets | 61,867 | 56,694 | 42,818
Contract liabilities | 223,202 | 184,821 | 150,333
Total assets | 1,382,664 | 1,206,518 | 1,097,568
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,179,321 | 1,175,469 | 1,021,217
Operating income (loss) | 35,375 | 19,787 | (1,666)
Capital expenditures | 10,433 | 9,905 | 6,159
Depreciation and amortization of property, plant, and equipment | 11,146 | 10,888 | 11,723
Contract assets | 17,129 | 10,727 | 18,992
Contract liabilities | 17,366 | 17,746 | 16,481
Total assets | 571,658 | 552,545 | 589,017
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 436,423 | 477,078 | 509,951
Operating income (loss) | 25,681 | 29,838 | 27,998
Capital expenditures | 1,984 | 2,816 | 3,015
Depreciation and amortization of property, plant, and equipment | 3,116 | 2,752 | 3,938
Contract assets | 20,173 | 30,520 | 30,849
Contract liabilities | 29,510 | 30,082 | 33,836
Total assets | 277,066 | 255,547 | 241,740
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (127,229) | (110,440) | (102,031)
Capital expenditures | 1,672 | 107 | 386
Depreciation and amortization of property, plant, and equipment | 983 | 1,657 | 2,013
Total assets | 891,793 | 596,591 | 992,882
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (182,508) | (210,042) | (150,754)
Intersegment Eliminations [Member] | UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | (2,284) | (4,190) | (3,275)
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ (9,100) | $ (10,882) | $ (6,835)

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