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Segment Information (Information About Industry Segments And Geographic Areas) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | $ 1,599,385,000 | $ 1,568,401,000 |
Total revenues | 1,599,385,000 | 1,568,401,000 |
Operating income (loss) | 69,374,000 | 51,265,000 |
Restructuring expenses | (909,000) | (1,363,000) |
Interest expense | (2,248,000) | (1,862,000) |
Interest income | 234,000 | 357,000 |
Income before income taxes | 67,360,000 | 49,760,000 |
Total assets | 3,407,516,000 |  | 3,465,915,000
Insurance recoveries |  | 2,600,000 |
United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring expenses | 0 | 0 |
United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring expenses | 76,000 | 0 |
United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring expenses | 0 | (38,000) |
United Kingdom Construction And Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring expenses | (685,000) | (1,325,000) |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring expenses | (300,000) | 0 |
Intersegment Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (23,197,000) | (20,609,000) |
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income (loss) | (15,467,000) | (14,358,000) |
Total assets | 420,572,000 |  | 482,388,000
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 1,501,149,000 | 1,449,401,000 |
Total revenues | 1,501,149,000 | 1,449,401,000 |
Operating income (loss) | 84,453,000 | 65,707,000 |
Total assets | 2,826,177,000 |  | 2,822,699,000
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 308,136,000 | 307,584,000 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 513,011,000 | 541,117,000 |
UNITED STATES | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 448,044,000 | 455,156,000 |
UNITED STATES | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 231,958,000 | 145,544,000 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 314,797,000 | 309,775,000 |
Operating income (loss) | 21,655,000 | 18,940,000 |
Total assets | 321,182,000 |  | 329,742,000
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 519,111,000 | 551,784,000 |
Operating income (loss) | 19,106,000 | 11,140,000 |
Total assets | 767,811,000 |  | 795,256,000
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 457,964,000 | 462,390,000 |
Operating income (loss) | 20,298,000 | 12,880,000 |
Total assets | 762,331,000 |  | 756,785,000
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 232,474,000 | 146,061,000 |
Operating income (loss) | 23,394,000 | 22,747,000 |
Total assets | 974,853,000 |  | 940,916,000
UNITED KINGDOM | United Kingdom Construction And Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from unrelated entities | 98,236,000 | 119,000,000 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Construction And Building Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 98,236,000 | 119,000,000 |
Operating income (loss) | 1,297,000 | 1,279,000 |
Total assets | $ 160,767,000 |  | $ 160,828,000

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