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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues from unrelated entities $ 2,304,049 $ 2,299,832  
Total revenues 2,304,049 2,299,832  
Operating income 117,004 105,995  
Restructuring expenses 0 (69)  
Net periodic pension (cost) income 908 742  
Interest expense, net (1,363) (2,488)  
Income before income taxes 116,549 104,249  
Total assets 5,061,189   $ 5,063,840
UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 2,177,314 2,187,455  
Total revenues 2,177,314 2,187,455  
Operating income 132,105 122,169  
Total assets 3,978,997   3,805,430
United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 456,168 461,803  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 903,925 834,112  
United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 581,839 527,611  
United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 235,382 363,929  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 126,735 112,377  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 457,363 462,615  
Total revenues 457,533 462,791  
Operating income 40,264 40,312  
Total assets 720,703   672,226
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities 905,546 835,996  
Total revenues 907,674 838,804  
Operating income 64,950 45,171  
Total assets 1,568,914   1,542,531
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 602,735 542,018  
Operating income 29,334 21,261  
Total assets 1,069,085   1,040,160
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Total revenues 245,928 370,143  
Operating income (2,443) 15,425  
Total assets 620,295   550,513
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM      
Segment Reporting Information [Line Items]      
Total revenues 126,735 112,377  
Operating income 9,411 5,764  
Total assets 242,050   227,894
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Total revenues (36,556) (26,301)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (1,195) (812)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES      
Segment Reporting Information [Line Items]      
Revenues from unrelated entities (1,621) (1,884)  
Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income (24,512) $ (21,869)  
Total assets $ 840,142   $ 1,030,516