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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 2,047,049 | $ 1,886,691 | $ 5,901,323 | $ 5,674,360 |
Total revenues | 2,047,049 | 1,886,691 | 5,901,323 | 5,674,360 |
Operating income (loss) | 111,776 | 106,044 | 289,436 | 280,845 |
Restructuring expenses | (229) | (46) | (693) | (954) |
Impairment loss on identifiable intangible assets | 0 | 0 | (907) | 0 |
Net periodic pension (cost) income | 615 | 415 | 2,069 | 1,209 |
Interest expense | (3,588) | (3,324) | (10,041) | (9,464) |
Interest income | 852 | 277 | 2,030 | 607 |
Income from continuing operations before income taxes | 109,655 | 103,412 | 283,494 | 273,197 |
Total assets | 3,995,893 |  | 3,995,893 |  | $ 3,965,904
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (28,887) | (25,204) | (82,226) | (75,992) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (23,113) | (22,632) | (65,508) | (63,755) |
Total assets | 459,225 |  | 459,225 |  | 582,403
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 1,946,483 | 1,800,789 | 5,588,360 | 5,430,282 |
Total revenues | 1,946,483 | 1,800,789 | 5,588,360 | 5,430,282 |
Operating income (loss) | 130,661 | 125,277 | 343,716 | 337,873 |
Total assets | 3,392,787 |  | 3,392,787 |  | 3,251,695
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 485,974 | 457,919 | 1,420,268 | 1,350,157 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 772,332 | 760,084 | 2,211,836 | 2,173,030 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 473,701 | 437,107 | 1,389,486 | 1,315,401 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 214,476 | 145,679 | 566,770 | 591,694 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 486,349 |  | 1,423,142 |  |
Total revenues | 486,642 | 460,066 | 1,425,190 | 1,355,206 |
Operating income (loss) | 34,473 | 46,583 | 106,309 | 109,735 |
Restructuring expenses |  |  | 0 | 0 |
Total assets | 650,693 |  | 650,693 |  | 617,471
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 775,316 |  | 2,221,029 |  |
Total revenues | 783,454 | 767,398 | 2,239,660 | 2,197,231 |
Operating income (loss) | 58,689 | 57,503 | 155,864 | 151,028 |
Restructuring expenses |  |  | 0 | (181) |
Total assets | 1,109,064 |  | 1,109,064 |  | 1,097,240
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 490,624 | 451,396 | 1,437,498 | 1,360,189 |
Operating income (loss) | 29,315 | 26,035 | 68,822 | 60,537 |
Restructuring expenses |  |  | (693) | (773) |
Total assets | 830,019 |  | 830,019 |  | 764,085
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 214,650 | 147,133 | 568,238 | 593,648 |
Operating income (loss) | 8,184 | (4,844) | 12,721 | 16,573 |
Total assets | 803,011 |  | 803,011 |  | 772,899
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (375) |  | (2,874) |  |
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (2,984) |  | (9,193) |  |
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 100,566 | 85,902 | 312,963 | 244,078 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 100,566 | 85,902 | 312,963 | 244,078 |
Operating income (loss) | 4,457 | $ 3,445 | 12,828 | $ 7,681 |
Total assets | $ 143,881 |  | $ 143,881 |  | $ 131,806

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