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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 1,953,886 | $ 1,895,937 | $ 3,854,274 | $ 3,787,669 |
Total revenues | 1,953,886 | 1,895,937 | 3,854,274 | 3,787,669 |
Operating income (loss) | 99,656 | 92,413 | 177,660 | 174,801 |
Restructuring expenses | (374) | (343) | (464) | (908) |
Impairment loss on identifiable intangible assets | (907) | 0 | (907) | 0 |
Net periodic pension (cost) income | 717 | 408 | 1,454 | 794 |
Interest expense | (3,457) | (3,069) | (6,453) | (6,140) |
Interest income | 634 | 73 | 1,178 | 330 |
Income from continuing operations before income taxes | 97,550 | 89,825 | 173,839 | 169,785 |
Total assets | 3,869,401 |  | 3,869,401 |  | $ 3,965,904
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (27,969) | (26,246) | (53,339) | (50,788) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (20,730) | (20,063) | (42,395) | (41,123) |
Total assets | 426,693 |  | 426,693 |  | 582,403
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 1,848,379 | 1,816,779 | 3,641,877 | 3,629,493 |
Total revenues | 1,848,379 | 1,816,779 | 3,641,877 | 3,629,493 |
Operating income (loss) | 117,066 | 109,801 | 213,055 | 212,596 |
Total assets | 3,297,749 |  | 3,297,749 |  | 3,251,695
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 479,542 | 449,222 | 934,294 | 892,238 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 740,657 | 741,817 | 1,439,504 | 1,412,946 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 461,033 | 438,264 | 915,785 | 878,294 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 167,147 | 187,476 | 352,294 | 446,015 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 481,011 |  | 936,793 |  |
Total revenues | 481,379 | 451,124 | 938,548 | 895,140 |
Operating income (loss) | 35,985 | 32,118 | 71,836 | 63,152 |
Restructuring expenses |  |  | 0 | 0 |
Total assets | 622,290 |  | 622,290 |  | 617,471
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 743,641 |  | 1,445,713 |  |
Total revenues | 750,326 | 750,442 | 1,456,206 | 1,429,833 |
Operating income (loss) | 57,583 | 53,073 | 97,175 | 93,525 |
Restructuring expenses |  |  | 0 | (218) |
Total assets | 1,093,404 |  | 1,093,404 |  | 1,097,240
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 476,775 | 453,849 | 946,874 | 908,793 |
Operating income (loss) | 22,430 | 20,237 | 39,507 | 34,502 |
Restructuring expenses |  |  | (464) | (690) |
Total assets | 804,025 |  | 804,025 |  | 764,085
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 167,868 | 187,610 | 353,588 | 446,515 |
Operating income (loss) | 1,068 | 4,373 | 4,537 | 21,417 |
Total assets | 778,030 |  | 778,030 |  | 772,899
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (1,469) |  | (2,499) |  |
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (2,984) |  | (6,209) |  |
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 105,507 | 79,158 | 212,397 | 158,176 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 105,507 | 79,158 | 212,397 | 158,176 |
Operating income (loss) | 4,601 | $ 3,018 | 8,371 | $ 4,236 |
Total assets | $ 144,959 |  | $ 144,959 |  | $ 131,806

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