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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ 2,707,388 $ 2,437,666 $ 5,299,937 $ 4,741,715  
Total revenues 2,707,388 2,437,666 5,299,937 4,741,715  
Total assets 5,146,444   5,146,444   $ 5,441,446
Net periodic pension (cost) income 1,094 922 2,263 1,830  
Interest expense, net (1,751) (1,316) (3,040) (2,679)  
Operating income (loss) 137,644 133,358 237,601 250,362  
Income before income taxes 136,987 132,964 236,824 249,513  
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 2,592,840 2,307,792 5,053,892 4,485,106  
Total revenues 2,592,840 2,307,792 5,053,892 4,485,106  
Total assets 4,528,503   4,528,503   4,206,824
Operating income (loss) 156,659 152,066 272,506 284,171  
United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 564,112 492,130 1,086,142 951,525  
United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,066,347 968,664 2,066,817 1,883,165  
United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 677,847 611,835 1,305,648 1,179,871  
United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 284,534 235,163 595,285 470,545  
United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 114,548 129,874 246,045 256,609  
Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 565,753 492,737 1,088,763 953,342  
Total revenues 566,029 492,814 1,089,443 953,589  
Total assets 921,152   921,152   855,417
Operating income (loss) 35,095 43,012 55,088 83,264  
Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,068,976 969,859 2,071,714 1,886,031  
Total revenues 1,073,623 971,215 2,078,479 1,887,937  
Total assets 1,800,072   1,800,072   1,672,546
Operating income (loss) 76,945 76,724 135,619 139,900  
Operating Segments [Member] | United States Building Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 702,829 636,978 1,355,060 1,227,423  
Total assets 1,193,169   1,193,169   1,089,844
Operating income (loss) 38,161 32,538 62,083 63,658  
Operating Segments [Member] | United States Industrial Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Total revenues 287,440 252,444 611,941 498,372  
Total assets 614,110   614,110   589,017
Operating income (loss) 6,458 (208) 19,716 (2,651)  
Operating Segments [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Total revenues 114,548 129,874 246,045 256,609  
Total assets 241,792   241,792   241,740
Operating income (loss) 6,415 7,047 17,003 16,458  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Total assets 376,149   376,149   $ 992,882
Operating income (loss) (25,430) (25,755) (51,908) (50,267)  
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (37,081) (45,659) (81,031) (82,215)  
Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities (1,641) (607) (2,621) (1,817)  
Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ (2,629) $ (1,195) $ (4,897) $ (2,866)