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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 2,287,741 | $ 2,047,049 | $ 6,770,671 | $ 5,901,323 |
Total revenues | 2,287,741 | 2,047,049 | 6,770,671 | 5,901,323 |
Operating income (loss) | 115,749 | 111,776 | 338,018 | 289,436 |
Restructuring expenses | (119) | (229) | (567) | (693) |
Impairment loss on identifiable intangible assets | 0 | 0 | 0 | (907) |
Net periodic pension (cost) income | 381 | 615 | 1,187 | 2,069 |
Interest expense, net | (2,678) | (2,736) | (8,732) | (8,011) |
Income from continuing operations before income taxes | 113,452 | 109,655 | 330,473 | 283,494 |
Total assets | 4,532,721 |  | 4,532,721 |  | $ 4,088,807
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (40,806) | (28,887) | (99,491) | (82,226) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (24,341) | (23,113) | (74,062) | (65,508) |
Total assets | 463,874 |  | 463,874 |  | 448,644
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 2,190,113 | 1,946,483 | 6,452,962 | 5,588,360 |
Total revenues | 2,190,113 | 1,946,483 | 6,452,962 | 5,588,360 |
Operating income (loss) | 135,455 | 130,661 | 398,276 | 343,716 |
Total assets | 3,905,778 |  | 3,905,778 |  | 3,493,784
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 554,637 | 485,974 | 1,652,109 | 1,420,268 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 869,188 | 759,495 | 2,444,683 | 2,168,127 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 532,122 | 473,701 | 1,567,899 | 1,389,486 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 234,166 | 227,313 | 788,271 | 610,479 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 555,928 | 486,349 | 1,654,819 | 1,423,142 |
Total revenues | 556,088 | 486,642 | 1,655,147 | 1,425,190 |
Operating income (loss) | 33,630 | 34,473 | 120,380 | 106,309 |
Restructuring expenses |  |  | 0 | 0 |
Total assets | 820,229 |  | 820,229 |  | 702,112
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 872,178 | 762,479 | 2,452,820 | 2,177,320 |
Total revenues | 877,571 | 770,617 | 2,465,287 | 2,195,951 |
Operating income (loss) | 61,213 | 59,236 | 156,152 | 156,273 |
Total assets | 1,228,920 |  | 1,228,920 |  | 1,080,829
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 550,002 | 490,624 | 1,622,509 | 1,437,498 |
Operating income (loss) | 35,051 | 29,315 | 90,535 | 68,822 |
Restructuring expenses |  |  | (567) | (693) |
Total assets | 984,514 |  | 984,514 |  | 846,221
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 247,258 | 227,487 | 809,510 | 611,947 |
Operating income (loss) | 5,561 | 7,637 | 31,209 | 12,312 |
Total assets | 872,115 |  | 872,115 |  | 864,622
UNITED STATES | Operating Segments [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring expenses |  |  | 0 | 0 |
UNITED STATES | Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (1,291) | (375) | (2,710) | (2,874) |
UNITED STATES | Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | (2,990) | (2,984) | (8,137) | (9,193) |
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 97,628 | 100,566 | 317,709 | 312,963 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 97,628 | 100,566 | 317,709 | 312,963 |
Operating income (loss) | 4,754 | $ 4,457 | 14,371 | $ 12,828 |
Total assets | $ 163,069 |  | $ 163,069 |  | $ 146,379

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