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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 1,886,691 | $ 1,923,174 | $ 5,674,360 | $ 5,601,560 |
Total revenues | 1,886,691 | 1,923,174 | 5,674,360 | 5,601,560 |
Operating income (loss) | 106,459 | 86,064 | 282,054 | 233,968 |
Restructuring expenses | (46) | (539) | (954) | (1,271) |
Interest expense | (3,324) | (3,479) | (9,464) | (8,973) |
Interest income | 277 | 161 | 607 | 518 |
Income from continuing operations before income taxes | 103,412 | 82,746 | 273,197 | 225,513 |
Total assets | 3,966,321 |  | 3,966,321 |  | $ 3,852,438
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (25,204) | (26,482) | (75,992) | (74,938) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (22,632) | (23,516) | (63,755) | (67,431) |
Total assets | 577,919 |  | 577,919 |  | 557,275
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 1,800,789 | 1,850,138 | 5,430,282 | 5,350,304 |
Total revenues | 1,800,789 | 1,850,138 | 5,430,282 | 5,350,304 |
Operating income (loss) | 125,204 | 107,528 | 337,654 | 293,510 |
Total assets | 3,266,743 |  | 3,266,743 |  | 3,190,082
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 457,919 | 458,553 | 1,350,157 | 1,227,474 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 760,084 | 691,818 | 2,173,030 | 1,925,793 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 437,107 | 460,715 | 1,315,401 | 1,366,973 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 145,679 | 239,052 | 591,694 | 830,064 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 460,066 | 465,476 | 1,355,206 | 1,249,681 |
Operating income (loss) | 46,583 | 30,927 | 109,735 | 70,645 |
Total assets | 595,680 |  | 595,680 |  | 631,581
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 767,398 | 696,549 | 2,197,231 | 1,937,089 |
Operating income (loss) | 57,484 | 38,890 | 150,971 | 100,607 |
Restructuring expenses |  |  | (181) | (401) |
Total assets | 1,055,857 |  | 1,055,857 |  | 954,633
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 451,396 | 475,106 | 1,360,189 | 1,407,361 |
Operating income (loss) | 25,981 | 23,125 | 60,375 | 55,658 |
Restructuring expenses |  |  | (773) | (870) |
Total assets | 774,449 |  | 774,449 |  | 753,434
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 147,133 | 239,489 | 593,648 | 831,111 |
Operating income (loss) | (4,844) | 14,586 | 16,573 | 66,600 |
Total assets | 840,757 |  | 840,757 |  | 850,434
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 85,902 | 73,036 | 244,078 | 251,256 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 85,902 | 73,036 | 244,078 | 251,256 |
Operating income (loss) | 3,933 | $ 2,591 | 9,109 | $ 9,160 |
Total assets | $ 121,659 |  | $ 121,659 |  | $ 105,081

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