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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities $ 2,281,494 $ 2,201,714 $ 2,014,021 $ 2,299,832 $ 2,403,940 $ 2,287,741 $ 2,324,202 $ 2,158,728 $ 8,797,061 $ 9,174,611 $ 8,130,631
Total revenues                 8,797,061 9,174,611 8,130,631
Operating income (loss)                 256,834 460,892 403,083
Restructuring expenses                 (2,214) (1,523) (2,306)
Impairment loss on goodwill, identifiable intangible assets, and long-lived assets 0 $ 0 $ (232,750) $ 0         (232,750) 0 (907)
Net periodic pension (cost) income                 2,980 1,553 2,743
Interest expense                 (9,009) (13,821) (13,544)
Interest income                 1,521 2,265 2,746
Income from continuing operations before income taxes                 252,326 450,889 395,028
Capital expenditures                 47,969 48,432 43,479
Depreciation and amortization of property, plant and equipment                 46,721 43,945 38,472
Contract assets 171,956       177,830       171,956 177,830 158,243
Contract liabilities 722,252       623,642       722,252 623,642 552,290
Long-lived assets 1,593,103       1,831,542       1,593,103 1,831,542 1,613,524
Total assets 5,063,840       4,830,358       5,063,840 4,830,358 4,088,807
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 8,366,498 8,751,352 7,715,760
Total revenues                 8,366,498 8,751,352 7,715,760
Operating income (loss)                 569,680 545,818 480,781
Capital expenditures                 39,880 43,859 42,297
Depreciation and amortization of property, plant and equipment                 42,106 40,196 34,291
Contract assets 141,401       152,286       141,401 152,286 135,135
Contract liabilities 692,403       601,042       692,403 601,042 536,385
Long-lived assets 1,576,730       1,820,489       1,576,730 1,820,489 1,603,188
Total assets 3,805,430       4,197,584       3,805,430 4,197,584 3,493,784
UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,973,427 2,216,600 1,954,323
UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 3,485,495 3,340,337 2,962,843
UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 2,110,129 2,106,872 1,875,485
UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 797,447 1,087,543 923,109
UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 430,563 423,259 414,871
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,978,546 2,219,974 1,957,819
Total revenues                 1,979,899 2,220,582 1,959,978
Operating income (loss)                 166,501 161,684 139,430
Restructuring expenses                 (1,072) (445)  
Capital expenditures                 9,569 5,876 5,993
Depreciation and amortization of property, plant and equipment                 7,463 7,550 6,221
Contract assets 33,640       50,813       33,640 50,813 38,412
Contract liabilities 184,775       173,967       184,775 173,967 163,951
Long-lived assets 211,432       215,780       211,432 215,780 201,333
Total assets 736,395       834,802       736,395 834,802 702,112
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 3,492,013 3,351,918 2,975,751
Total revenues                 3,502,131 3,370,960 2,998,918
Operating income (loss)                 292,536 225,040 219,853
Restructuring expenses                 (1,073) 0  
Capital expenditures                 11,239 7,890 7,504
Depreciation and amortization of property, plant and equipment                 10,683 8,764 7,803
Contract assets 68,058       61,225       68,058 61,225 49,302
Contract liabilities 386,180       317,083       386,180 317,083 280,846
Long-lived assets 512,243       530,561       512,243 530,561 334,628
Total assets 1,542,531       1,536,325       1,542,531 1,536,325 1,081,005
Operating Segments [Member] | UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 2,189,236 2,182,390 1,942,663
Operating income (loss)                 113,431 114,754 93,827
Restructuring expenses                 (69) (1,078)  
Capital expenditures                 10,366 14,291 10,414
Depreciation and amortization of property, plant and equipment                 12,284 12,728 10,324
Contract assets 31,046       30,428       31,046 30,428 33,304
Contract liabilities 105,421       97,588       105,421 97,588 79,281
Long-lived assets 492,290       458,915       492,290 458,915 436,887
Total assets 1,032,326       996,664       1,032,326 996,664 846,221
Operating Segments [Member] | UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 812,844 1,111,264 930,724
Operating income (loss)                 (2,788) 44,340 27,671
Capital expenditures                 8,706 15,802 18,386
Depreciation and amortization of property, plant and equipment                 11,676 11,154 9,943
Contract assets 8,657       9,820       8,657 9,820 14,117
Contract liabilities 16,027       12,404       16,027 12,404 12,307
Long-lived assets 360,765       615,233       360,765 615,233 630,340
Total assets 494,178       829,793       494,178 829,793 864,446
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 430,563 423,259 414,871
Operating income (loss)                 20,660 18,323 15,930
Capital expenditures                 3,693 3,598 870
Depreciation and amortization of property, plant and equipment                 3,046 2,942 3,447
Contract assets 30,555       25,544       30,555 25,544 23,108
Contract liabilities 29,849       22,600       29,849 22,600 15,905
Long-lived assets 12,017       9,622       12,017 9,622 9,264
Total assets 227,894       181,147       227,894 181,147 146,379
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (98,542) (101,726) (90,415)
Restructuring expenses                 0 0  
Capital expenditures                 4,396 975 312
Depreciation and amortization of property, plant and equipment                 1,569 807 734
Long-lived assets 4,356       1,431       4,356 1,431 1,072
Total assets $ 1,030,516       $ 451,627       1,030,516 451,627 448,644
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 (117,612) (133,844) (116,523)
Intersegment Eliminations [Member] | UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 (5,119) (3,374) (3,496)
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 $ (6,518) $ (11,581) $ (12,908)