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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities $ 1,949,964 $ 1,923,174 $ 1,933,416 $ 1,744,970 $ 1,777,826 $ 1,699,128 $ 1,652,585 $ 1,589,187 $ 7,551,524 $ 6,718,726 $ 6,424,965
Total revenues                 7,551,524 6,718,726 6,424,965
Operating income (loss)                 308,458 287,082 289,878
Restructuring expenses                 (1,438) (824) (1,168)
Impairment loss on identifiable intangible assets (2,428) $ 0 $ 0 $ 0 0 $ 0 $ 0 $ 0 (2,428) 0 (1,471)
Gain on sale of building                 0 0 11,749
Interest expense                 (12,627) (8,932) (9,075)
Interest income                 663 673 842
Income from continuing operations before income taxes                 296,494 278,823 281,645
Capital expenditures                 39,648 35,460 38,035
Depreciation and amortization of Property, plant and equipment                 38,881 36,294 36,524
Costs and estimated earnings in excess of billings on uncompleted contracts 130,697       117,734       130,697 117,734 103,201
Billings in excess of costs and estimated earnings on uncompleted contracts 489,242       429,235       489,242 429,235 368,555
Long-lived assets 1,594,977       1,438,022       1,594,977 1,438,022 1,458,340
Total assets 3,894,170       3,542,657       3,894,170 3,542,657 3,383,847
Loss on contracts                   0  
Settlement of contract claim                 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         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 Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Income from reduction in estimate of certain accrued contract costs                     4,800
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 7,225,268 6,341,249 6,074,521
Total revenues                 7,225,268 6,341,249 6,074,521
Operating income (loss)                 389,118 347,914 334,335
Capital expenditures                 34,111 29,714 35,030
Depreciation and amortization of Property, plant and equipment                 34,497 31,763 32,336
Costs and estimated earnings in excess of billings on uncompleted contracts 123,552       109,653       123,552 109,653 94,743
Billings in excess of costs and estimated earnings on uncompleted contracts 487,974       423,966       487,974 423,966 353,980
Long-lived assets 1,581,797       1,425,552       1,581,797 1,425,552 1,449,418
Total assets 3,190,082       2,871,882       3,190,082 2,871,882 2,816,306
UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,704,403 1,367,142 1,311,988
UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 2,661,763 2,312,763 2,201,212
UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,791,787 1,739,259 1,721,341
UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 1,067,315 922,085 839,980
UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Revenues from unrelated entities                 326,256 377,477 350,444
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,728,920 1,378,620 1,326,547
Operating income (loss)                 101,761 82,225 90,873
Restructuring expenses                 0    
Capital expenditures                 5,294 6,063 6,671
Depreciation and amortization of Property, plant and equipment                 6,318 4,676 4,237
Costs and estimated earnings in excess of billings on uncompleted contracts 46,193       39,116       46,193 39,116 32,464
Billings in excess of costs and estimated earnings on uncompleted contracts 163,794       139,857       163,794 139,857 114,422
Long-lived assets 183,632       20,139       183,632 20,139 18,792
Total assets 631,581       372,525       631,581 372,525 332,150
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 2,680,542 2,326,683 2,219,886
Operating income (loss)                 133,742 138,688 114,418
Restructuring expenses                 (519) (6)  
Capital expenditures                 8,004 5,345 8,631
Depreciation and amortization of Property, plant and equipment                 7,594 7,624 7,600
Costs and estimated earnings in excess of billings on uncompleted contracts 47,437       46,220       47,437 46,220 43,443
Billings in excess of costs and estimated earnings on uncompleted contracts 272,978       238,463       272,978 238,463 199,983
Long-lived assets 289,676       296,633       289,676 296,633 288,161
Total assets 960,748       894,366       960,748 894,366 793,056
Operating Segments [Member] | UNITED STATES | United States Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,846,382 1,794,086 1,762,697
Operating income (loss)                 75,770 70,532 65,885
Restructuring expenses                 (919) (924)  
Capital expenditures                 10,748 7,233 10,589
Depreciation and amortization of Property, plant and equipment                 10,191 9,834 10,660
Costs and estimated earnings in excess of billings on uncompleted contracts 27,350       20,959       27,350 20,959 18,555
Billings in excess of costs and estimated earnings on uncompleted contracts 49,379       44,476       49,379 44,476 38,059
Long-lived assets 399,222       378,367       399,222 378,367 392,364
Total assets 747,319       721,653       747,319 721,653 737,082
Operating Segments [Member] | UNITED STATES | United States Industrial Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,068,662 923,648 842,040
Operating income (loss)                 77,845 56,469 63,159
Capital expenditures                 10,065 11,073 9,139
Depreciation and amortization of Property, plant and equipment                 10,394 9,629 9,839
Costs and estimated earnings in excess of billings on uncompleted contracts 2,572       3,358       2,572 3,358 281
Billings in excess of costs and estimated earnings on uncompleted contracts 1,823       1,170       1,823 1,170 1,516
Long-lived assets 709,267       730,413       709,267 730,413 750,101
Total assets 850,434       883,338       850,434 883,338 954,018
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services                      
Segment Reporting Information [Line Items]                      
Total revenues                 326,256 377,477 350,444
Operating income (loss)                 11,946 11,634 15,011
Capital expenditures                 4,523 5,298 1,935
Depreciation and amortization of Property, plant and equipment                 3,560 3,603 3,305
Costs and estimated earnings in excess of billings on uncompleted contracts 7,145       8,081       7,145 8,081 8,458
Billings in excess of costs and estimated earnings on uncompleted contracts 1,268       5,269       1,268 5,269 14,575
Long-lived assets 11,446       10,927       11,446 10,927 6,899
Total assets 105,081       133,782       105,081 133,782 130,340
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (88,740) (71,642) (68,578)
Capital expenditures                 1,014 448 1,070
Depreciation and amortization of Property, plant and equipment                 824 928 883
Long-lived assets 1,734       1,543       1,734 1,543 2,023
Total assets $ 599,007       $ 536,993       599,007 536,993 437,201
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ (99,238) $ (81,788) $ (76,649)