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Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Company
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]          
Number of operating subsidiaries | Company     100    
Revenues from unrelated entities $ 3,045,622 $ 2,707,388 $ 5,936,054 $ 5,299,937  
Total revenues 3,045,622 2,707,388 5,936,054 5,299,937  
Total assets 5,907,669   5,907,669   $ 5,524,607
Net periodic pension (cost) income (282) 1,094 (556) 2,263  
Interest expense, net (2,692) (1,751) (4,524) (3,040)  
Operating income (loss) 196,667 137,644 351,577 237,601  
Income before income taxes 193,693 136,987 346,497 236,824  
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 2,939,575 2,592,840 5,719,137 5,053,892  
Total revenues 2,939,575 2,592,840 5,719,137 5,053,892  
Total assets 5,052,719   5,052,719   4,672,469
Operating income (loss) 224,593 156,659 404,006 272,506  
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 678,167 564,112 1,322,913 1,086,142  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,194,113 1,057,649 2,272,671 2,050,293  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 775,012 686,545 1,500,387 1,322,172  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 292,283 284,534 623,166 595,285  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 106,047 114,548 216,917 246,045  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 678,709 565,753 1,324,236 1,088,763  
Total revenues 679,006 566,029 1,324,660 1,089,443  
Total assets 1,124,329   1,124,329   1,078,405
Operating income (loss) 50,722 35,095 91,238 55,088  
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,195,812 1,060,279 2,275,848 2,055,191  
Total revenues 1,209,242 1,064,925 2,308,726 2,061,955  
Total assets 2,049,168   2,049,168   1,835,001
Operating income (loss) 119,847 76,612 206,074 135,045  
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 802,934 711,527 1,551,544 1,371,584  
Total assets 1,312,263   1,312,263   1,206,518
Operating income (loss) 46,137 38,494 83,787 62,657  
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 293,057 287,440 631,564 611,941  
Total assets 566,959   566,959   552,545
Operating income (loss) 7,887 6,458 22,907 19,716  
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 106,047 114,548 216,917 246,045  
Total assets 268,845   268,845   255,547
Operating income (loss) 5,927 6,415 11,351 17,003  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Total assets 586,105   586,105   $ 596,591
Operating income (loss) (33,853) (25,430) (63,780) (51,908)  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (44,664) (37,081) (97,357) (81,031)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (542) (1,641) (1,323) (2,621)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (1,699) $ (2,630) $ (3,177) $ (4,898)