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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 1,744,970 | $ 1,589,187 |
Total revenues | 1,744,970 | 1,589,187 |
Operating income (loss) | 55,615 | 55,330 |
Restructuring expenses | (91) | (8) |
Interest expense | (2,376) | (2,216) |
Interest income | 165 | 176 |
Income from continuing operations before income taxes | 53,404 | 53,290 |
Total assets | 3,449,659 |  | $ 3,542,657
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (22,207) | (14,412) |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (20,957) | (18,426) |
Total assets | 441,343 |  | 536,993
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 1,657,334 | 1,502,237 |
Total revenues | 1,657,334 | 1,502,237 |
Operating income (loss) | 73,352 | 71,386 |
Total assets | 2,876,998 |  | 2,871,882
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 348,289 | 318,994 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 611,890 | 511,026 |
UNITED STATES | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 439,651 | 439,492 |
UNITED STATES | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 257,504 | 232,725 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 354,104 | 320,238 |
Operating income (loss) | 16,707 | 16,674 |
Restructuring expenses | 0 | (2) |
Total assets | 365,229 |  | 372,525
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 615,232 | 513,367 |
Operating income (loss) | 23,877 | 20,901 |
Restructuring expenses | 0 | (6) |
Total assets | 858,499 |  | 894,366
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 452,335 | 449,728 |
Operating income (loss) | 13,902 | 20,978 |
Restructuring expenses | (91) | 0 |
Total assets | 724,330 |  | 721,653
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 257,870 | 233,316 |
Operating income (loss) | 18,866 | 12,833 |
Total assets | 928,940 |  | 883,338
UNITED KINGDOM | United Kingdom Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 87,636 | 86,950 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 87,636 | 86,950 |
Operating income (loss) | 3,311 | $ 2,378 |
Total assets | $ 131,318 |  | $ 133,782

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