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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)

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