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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 1,652,585 | $ 1,552,918 | $ 3,241,772 | $ 3,143,457 |
Total revenues | 1,652,585 | 1,552,918 | 3,241,772 | 3,143,457 |
Operating income (loss) | 77,703 | 69,659 | 133,033 | 141,783 |
Restructuring expenses | (433) | (176) | (441) | (401) |
Interest expense | (2,208) | (2,242) | (4,424) | (4,490) |
Interest income | 182 | 221 | 358 | 455 |
Income from continuing operations before income taxes | 75,677 | 67,638 | 128,967 | 137,748 |
Total assets | 3,417,786 |  | 3,417,786 |  | $ 3,388,967
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (18,828) | (19,670) | (33,240) | (42,867) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (17,693) | (16,244) | (36,119) | (31,711) |
Restructuring expenses |  |  | 0 | (300) |
Total assets | 401,319 |  | 401,319 |  | 442,321
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 1,561,000 | 1,469,422 | 3,063,237 | 2,970,571 |
Total revenues | 1,561,000 | 1,469,422 | 3,063,237 | 2,970,571 |
Operating income (loss) | 92,995 | 79,877 | 164,381 | 164,330 |
Total assets | 2,873,641 |  | 2,873,641 |  | 2,816,306
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 346,202 | 335,492 | 665,196 | 643,628 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 554,003 | 538,556 | 1,065,029 | 1,051,567 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 435,627 | 418,142 | 875,119 | 866,186 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 225,168 | 177,232 | 457,893 | 409,190 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 347,448 | 340,155 | 667,686 | 654,952 |
Operating income (loss) | 25,277 | 24,841 | 41,951 | 46,496 |
Restructuring expenses |  |  |  | (182) |
Total assets | 365,085 |  | 365,085 |  | 332,150
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 557,815 | 543,606 | 1,071,182 | 1,062,717 |
Operating income (loss) | 32,364 | 28,740 | 53,265 | 47,846 |
Restructuring expenses |  |  | (6) |  |
Total assets | 825,617 |  | 825,617 |  | 793,056
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 448,990 | 427,988 | 898,718 | 885,952 |
Operating income (loss) | 17,939 | 13,920 | 38,917 | 34,218 |
Restructuring expenses |  |  | (541) | 0 |
Total assets | 743,015 |  | 743,015 |  | 737,082
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 225,575 | 177,343 | 458,891 | 409,817 |
Operating income (loss) | 17,415 | 12,376 | 30,248 | 35,770 |
Total assets | 939,924 |  | 939,924 |  | 954,018
UNITED KINGDOM | United Kingdom Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 91,585 | 83,496 | 178,535 | 172,886 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 91,585 | 83,496 | 178,535 | 172,886 |
Operating income (loss) | 2,834 | $ 6,202 | 5,212 | $ 9,565 |
Total assets | $ 142,826 |  | $ 142,826 |  | $ 130,340

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