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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ 2,014,021 $ 2,324,202 $ 4,313,853 $ 4,482,930  
Total revenues 2,014,021 2,324,202 4,313,853 4,482,930  
Operating (loss) income (122,638) 119,959 (16,643) 222,269  
Restructuring expenses 0 (173) (69) (448)  
Impairment loss on goodwill, identifiable intangible assets, and other long-lived assets (232,750) 0 (232,750) 0  
Net periodic pension (cost) income 718 400 1,460 806  
Interest expense, net (2,110) (3,231) (4,598) (6,054)  
(Loss) income before income taxes (124,030) 117,128 (19,781) 217,021  
Total assets 4,590,423   4,590,423   $ 4,830,358
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (26,366) (31,271) (52,667) (58,685)  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating (loss) income (23,699) (27,110) (45,568) (49,721)  
Total assets 527,542   527,542   451,627
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,920,904 2,211,646 4,108,359 4,262,849  
Total revenues 1,920,904 2,211,646 4,108,359 4,262,849  
Operating (loss) income 128,460 141,766 250,629 262,821  
Total assets 3,872,367   3,872,367   4,197,584
UNITED STATES | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 445,881 569,402 971,110 1,097,472  
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 790,441 823,086 1,624,553 1,575,495  
UNITED STATES | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 472,416 523,698 990,499 1,035,777  
UNITED STATES | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 212,166 295,460 522,197 554,105  
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 446,716 570,021 972,701 1,098,891  
Total revenues 446,912 570,077 973,157 1,099,059  
Operating (loss) income 32,184 43,799 76,087 86,750  
Restructuring expenses     0 0  
Total assets 752,725   752,725   834,802
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 791,411 825,365 1,627,407 1,580,642  
Total revenues 793,040 827,952 1,631,844 1,587,716  
Operating (loss) income 66,937 53,954 112,108 94,939  
Total assets 1,513,504   1,513,504   1,536,325
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 493,450 541,911 1,025,927 1,072,507  
Operating (loss) income 26,378 28,001 47,216 55,484  
Restructuring expenses     (69) (448)  
Total assets 969,503   969,503   996,664
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 213,868 302,977 530,098 562,252  
Operating (loss) income 2,961 16,012 15,218 25,648  
Total assets 636,635   636,635   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 (835) (619) (1,591) (1,419)  
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (970) (2,279) (2,854) (5,147)  
UNITED KINGDOM | United Kingdom Building Services [Member] [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 93,117 112,556 205,494 220,081  
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member]          
Segment Reporting Information [Line Items]          
Total revenues 93,117 112,556 205,494 220,081  
Operating (loss) income 5,351 $ 5,476 11,115 $ 9,617  
Total assets $ 190,514   $ 190,514   $ 181,147