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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities $ 2,012,639 $ 1,886,691 $ 1,895,937 $ 1,891,732 $ 1,949,964 $ 1,923,174 $ 1,933,416 $ 1,744,970 $ 7,686,999 $ 7,551,524 $ 6,718,726
Total revenues                 7,686,999 7,551,524 6,718,726
Operating income (loss)                 330,554 308,458 287,082
Restructuring expenses                 (1,577) (1,438) (824)
Impairment loss on identifiable intangible assets                 (57,819) (2,428) 0
Interest expense                 (12,770) (12,627) (8,932)
Interest income                 965 663 673
Income from continuing operations before income taxes                 318,749 296,494 278,823
Capital expenditures                 34,684 39,648 35,460
Depreciation and amortization of Property, plant and equipment                 39,915 38,881 36,294
Costs and estimated earnings in excess of billings on uncompleted contracts 122,621       130,697       122,621 130,697 117,734
Billings in excess of costs and estimated earnings on uncompleted contracts 524,156       489,242       524,156 489,242 429,235
Long-lived assets 1,587,085       1,594,977       1,587,085 1,594,977 1,438,022
Total assets 3,965,904       3,852,438       3,965,904 3,852,438 3,506,706
Settlement of contract claim                 18,100 0  
Loss on contracts                 0    
United States electrical construction and facilities services segment | Transportation Sector [Member]                      
Segment Reporting Information [Line Items]                      
Loss on contracts                   19,400  
United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Settlement of contract claim                     12,100
United States Mechanical Construction And Facilities Services | Manufacturing Sector [Member]                      
Segment Reporting Information [Line Items]                      
Loss on contracts                   18,300  
United States Mechanical Construction And Facilities Services | Institutional Sector [Member]                      
Segment Reporting Information [Line Items]                      
Loss on contracts                   9,600  
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 7,346,254 7,225,268 6,341,249
Total revenues                 7,346,254 7,225,268 6,341,249
Operating income (loss)                 462,909 389,118 347,914
Capital expenditures                 31,903 34,111 29,714
Depreciation and amortization of Property, plant and equipment                 35,689 34,497 31,763
Costs and estimated earnings in excess of billings on uncompleted contracts 115,105       123,552       115,105 123,552 109,653
Billings in excess of costs and estimated earnings on uncompleted contracts 520,249       487,974       520,249 487,974 423,966
Long-lived assets 1,573,862       1,581,797       1,573,862 1,581,797 1,425,552
Total assets 3,251,695       3,190,082       3,251,695 3,190,082 2,871,882
UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,829,567 1,704,403 1,367,142
UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 2,963,815 2,643,321 2,293,038
UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,753,703 1,810,229 1,758,984
UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 799,169 1,067,315 922,085
UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 340,745 326,256 377,477
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,836,985 1,728,920 1,378,620
Operating income (loss)                 150,001 101,761 82,225
Restructuring expenses                 (452)    
Capital expenditures                 4,797 5,294 6,063
Depreciation and amortization of Property, plant and equipment                 6,545 6,318 4,676
Costs and estimated earnings in excess of billings on uncompleted contracts 35,060       46,193       35,060 46,193 39,116
Billings in excess of costs and estimated earnings on uncompleted contracts 178,454       163,794       178,454 163,794 139,857
Long-lived assets 180,990       183,632       180,990 183,632 20,139
Total assets 617,471       631,581       617,471 631,581 372,525
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 2,994,700 2,662,100 2,306,958
Operating income (loss)                 212,320 132,667 138,444
Restructuring expenses                 (180) (519)  
Capital expenditures                 6,778 7,672 5,312
Depreciation and amortization of Property, plant and equipment                 7,819 7,544 7,562
Costs and estimated earnings in excess of billings on uncompleted contracts 52,381       46,703       52,381 46,703 45,787
Billings in excess of costs and estimated earnings on uncompleted contracts 290,216       271,811       290,216 271,811 237,623
Long-lived assets 352,970       287,744       352,970 287,744 294,969
Total assets 1,097,240       954,633       1,097,240 954,633 888,322
Operating Segments [Member] | UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,812,763 1,864,824 1,813,811
Operating income (loss)                 81,504 76,845 70,776
Restructuring expenses                 (945) (919)  
Capital expenditures                 10,745 11,080 7,266
Depreciation and amortization of Property, plant and equipment                 11,051 10,241 9,896
Costs and estimated earnings in excess of billings on uncompleted contracts 26,028       28,084       26,028 28,084 21,392
Billings in excess of costs and estimated earnings on uncompleted contracts 48,481       50,546       48,481 50,546 45,316
Long-lived assets 409,718       401,154       409,718 401,154 380,031
Total assets 764,085       753,434       764,085 753,434 727,697
Operating Segments [Member] | UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 801,531 1,068,662 923,648
Operating income (loss)                 19,084 77,845 56,469
Capital expenditures                 9,583 10,065 11,073
Depreciation and amortization of Property, plant and equipment                 10,274 10,394 9,629
Costs and estimated earnings in excess of billings on uncompleted contracts 1,636       2,572       1,636 2,572 3,358
Billings in excess of costs and estimated earnings on uncompleted contracts 3,098       1,823       3,098 1,823 1,170
Long-lived assets 630,184       709,267       630,184 709,267 730,413
Total assets 772,899       850,434       772,899 850,434 883,338
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 340,745 326,256 377,477
Operating income (loss)                 14,849 11,946 11,634
Capital expenditures                 2,166 4,523 5,298
Depreciation and amortization of Property, plant and equipment                 3,371 3,560 3,603
Costs and estimated earnings in excess of billings on uncompleted contracts 7,516       7,145       7,516 7,145 8,081
Billings in excess of costs and estimated earnings on uncompleted contracts 3,907       1,268       3,907 1,268 5,269
Long-lived assets 11,729       11,446       11,729 11,446 10,927
Total assets 131,806       105,081       131,806 105,081 133,782
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (87,808) (88,740) (71,642)
Capital expenditures                 615 1,014 448
Depreciation and amortization of Property, plant and equipment                 855 824 928
Long-lived assets 1,494       1,734       1,494 1,734 1,543
Total assets $ 582,403       $ 557,275       582,403 557,275 501,042
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ (99,725) $ (99,238) $ (81,788)