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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 1,891,732 | $ 1,744,970 |
Total revenues | 1,891,732 | 1,744,970 |
Operating income (loss) | 82,774 | 55,615 |
Restructuring expenses | (565) | (91) |
Interest expense | (3,071) | (2,376) |
Interest income | 257 | 165 |
Income from continuing operations before income taxes | 79,960 | 53,404 |
Total assets | 3,805,162 |  | $ 3,852,438
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (24,542) | (22,207) |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (21,060) | (20,957) |
Total assets | 413,923 |  | 557,275
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 1,812,714 | 1,657,334 |
Total revenues | 1,812,714 | 1,657,334 |
Operating income (loss) | 102,720 | 73,352 |
Total assets | 3,276,288 |  | 3,190,082
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 443,016 | 348,289 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 671,129 | 608,428 |
UNITED STATES | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 440,030 | 443,113 |
UNITED STATES | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 258,539 | 257,504 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 444,016 | 354,104 |
Operating income (loss) | 31,034 | 16,707 |
Total assets | 617,529 |  | 631,581
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 679,391 | 611,770 |
Operating income (loss) | 40,433 | 23,781 |
Restructuring expenses | (62) | 0 |
Total assets | 958,733 |  | 954,633
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 454,944 | 455,797 |
Operating income (loss) | 14,209 | 13,998 |
Restructuring expenses | (503) | (91) |
Total assets | 798,606 |  | 753,434
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 258,905 | 257,870 |
Operating income (loss) | 17,044 | 18,866 |
Total assets | 901,420 |  | 850,434
UNITED KINGDOM | United Kingdom Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 79,018 | 87,636 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 79,018 | 87,636 |
Operating income (loss) | 1,679 | $ 3,311 |
Total assets | $ 114,951 |  | $ 105,081

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