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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ 2,201,714 $ 2,287,741 $ 6,515,567 $ 6,770,671  
Total revenues 2,201,714 2,287,741 6,515,567 6,770,671  
Operating income (loss) 135,855 115,749 119,212 338,018  
Restructuring expenses (536) (119) (605) (567)  
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets 0 0 (232,750) 0  
Net periodic pension (cost) income 751 381 2,211 1,187  
Interest expense, net (1,484) (2,678) (6,082) (8,732)  
Income before income taxes 135,122 113,452 115,341 330,473  
Total assets 4,829,985   4,829,985   $ 4,830,358
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (33,112) (40,806) (85,779) (99,491)  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (24,454) (24,341) (70,022) (74,062)  
Total assets 735,977   735,977   451,627
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 2,091,639 2,190,113 6,199,998 6,452,962  
Total revenues 2,091,639 2,190,113 6,199,998 6,452,962  
Operating income (loss) 155,518 135,455 406,147 398,276  
Total assets 3,887,092   3,887,092   4,197,584
UNITED STATES | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 508,863 554,637 1,479,973 1,652,109  
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 891,509 869,188 2,516,062 2,444,683  
UNITED STATES | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 551,555 532,122 1,542,054 1,567,899  
UNITED STATES | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 139,712 234,166 661,909 788,271  
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 510,679 555,928 1,483,380 1,654,819  
Total revenues 511,257 556,088 1,484,414 1,655,147  
Operating income (loss) 47,059 33,630 123,146 120,380  
Restructuring expenses     (268) 0  
Total assets 762,516   762,516   834,802
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 893,667 872,178 2,521,074 2,452,820  
Total revenues 896,551 877,571 2,528,395 2,465,287  
Operating income (loss) 80,048 61,213 192,156 156,152  
Restructuring expenses     (268) 0  
Total assets 1,532,550   1,532,550   1,536,325
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 573,299 550,002 1,599,226 1,622,509  
Operating income (loss) 38,205 35,051 85,421 90,535  
Restructuring expenses     (69) (567)  
Total assets 1,068,399   1,068,399   996,664
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 143,644 247,258 673,742 809,510  
Operating income (loss) (9,794) 5,561 5,424 31,209  
Total assets 523,627   523,627   829,793
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Restructuring expenses     0 0  
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (1,816) (1,291) (3,407) (2,710)  
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (2,158) (2,990) (5,012) (8,137)  
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 110,075 97,628 315,569 317,709  
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]          
Segment Reporting Information [Line Items]          
Total revenues 110,075 97,628 315,569 317,709  
Operating income (loss) 5,327 $ 4,754 16,442 $ 14,371  
Total assets $ 206,916   $ 206,916   $ 181,147