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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)

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