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Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 9,903,580 | $ 8,797,061 | $ 9,174,611
Total revenues | 9,903,580 | 8,797,061 | 9,174,611
Operating income (loss) | 530,800 | 256,834 | 460,892
Restructuring expenses | 0 | (2,214) | (1,523)
Impairment loss on goodwill, identifiable intangible assets, and long-lived assets | 0 | (232,750) | 0
Net periodic pension (cost) income | 3,625 | 2,980 | 1,553
Interest expense | (6,071) | (9,009) | (13,821)
Interest income | 949 | 1,521 | 2,265
Income before income taxes | 529,303 | 252,326 | 450,889
Capital expenditures | 36,192 | 47,969 | 48,432
Depreciation and amortization of property, plant and equipment | 48,347 | 46,721 | 43,945
Contract assets | 230,143 | 171,956 | 177,830
Contract liabilities | 788,134 | 722,252 | 623,642
Long-lived assets | 1,631,699 | 1,593,103 | 1,831,542
Total assets | 5,441,446 | 5,063,840 | 4,830,358
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 9,393,629 | 8,366,498 | 8,751,352
Total revenues | 9,393,629 | 8,366,498 | 8,751,352
Operating income (loss) | 604,833 | 569,680 | 545,818
Capital expenditures | 32,791 | 39,880 | 43,859
Depreciation and amortization of property, plant and equipment | 42,396 | 42,106 | 40,196
Contract assets | 199,294 | 141,401 | 152,286
Contract liabilities | 754,298 | 692,403 | 601,042
Long-lived assets | 1,617,762 | 1,576,730 | 1,820,489
Total assets | 4,206,824 | 3,805,430 | 4,197,584
UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 2,015,466 | 1,806,092 | 1,961,798
UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 3,922,864 | 3,485,495 | 3,340,337
UNITED STATES | United States Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 2,468,892 | 2,134,016 | 2,121,661
UNITED STATES | United States Industrial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 986,407 | 940,895 | 1,327,556
UNITED KINGDOM | United Kingdom Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 509,951 | 430,563 | 423,259
Operating Segments [Member] | UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 2,018,706 | 1,811,217 | 1,965,026
Total revenues | 2,019,400 | 1,812,445 | 1,965,483
Operating income (loss) | 168,363 | 161,810 | 147,817
Capital expenditures | 4,976 | 8,674 | 4,839
Depreciation and amortization of property, plant and equipment | 7,189 | 6,693 | 6,664
Contract assets | 48,161 | 30,728 | 47,522
Contract liabilities | 198,247 | 182,228 | 166,448
Long-lived assets | 236,813 | 176,708 | 175,038
Total assets | 848,306 | 672,226 | 736,688
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 3,930,753 | 3,492,013 | 3,351,918
Total revenues | 3,939,753 | 3,502,131 | 3,370,960
Operating income (loss) | 319,112 | 292,536 | 225,040
Capital expenditures | 10,420 | 11,239 | 7,890
Depreciation and amortization of property, plant and equipment | 11,130 | 10,683 | 8,764
Contract assets | 87,516 | 68,058 | 61,225
Contract liabilities | 406,509 | 386,180 | 317,083
Long-lived assets | 506,290 | 512,243 | 530,561
Total assets | 1,668,419 | 1,542,531 | 1,536,325
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 2,564,013 | 2,213,161 | 2,197,305
Operating income (loss) | 119,024 | 114,159 | 115,432
Capital expenditures | 11,236 | 10,372 | 14,370
Depreciation and amortization of property, plant and equipment | 12,354 | 12,325 | 12,752
Contract assets | 44,625 | 31,304 | 30,557
Contract liabilities | 133,061 | 106,691 | 101,963
Long-lived assets | 509,096 | 493,274 | 459,934
Total assets | 1,101,082 | 1,040,160 | 1,008,263
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,021,217 | 956,373 | 1,351,448
Operating income (loss) | (1,666) | 1,175 | 57,529
Capital expenditures | 6,159 | 9,595 | 16,760
Depreciation and amortization of property, plant and equipment | 11,723 | 12,405 | 12,016
Contract assets | 18,992 | 11,311 | 12,982
Contract liabilities | 16,481 | 17,304 | 15,548
Long-lived assets | 365,563 | 394,505 | 654,956
Total assets | 589,017 | 550,513 | 916,308
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 509,951 | 430,563 | 423,259
Operating income (loss) | 27,998 | 20,660 | 18,323
Capital expenditures | 3,015 | 3,693 | 3,598
Depreciation and amortization of property, plant and equipment | 3,938 | 3,046 | 2,942
Contract assets | 30,849 | 30,555 | 25,544
Contract liabilities | 33,836 | 29,849 | 22,600
Long-lived assets | 11,402 | 12,017 | 9,622
Total assets | 241,740 | 227,894 | 181,147
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (102,031) | (98,542) | (101,726)
Capital expenditures | 386 | 4,396 | 975
Depreciation and amortization of property, plant and equipment | 2,013 | 1,569 | 807
Long-lived assets | 2,535 | 4,356 | 1,431
Total assets | 992,882 | 1,030,516 | 451,627
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (150,754) | (117,612) | (133,844)
Intersegment Eliminations [Member] | UNITED STATES | United States Electrical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | (3,240) | (5,125) | (3,228)
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ (7,889) | $ (6,518) | $ (11,581)

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