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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | $ 1,923,174 | $ 1,699,128 | $ 5,601,560 | $ 4,940,900 |
Total revenues | 1,923,174 | 1,699,128 | 5,601,560 | 4,940,900 |
Operating income (loss) | 86,064 | 69,966 | 233,968 | 202,999 |
Restructuring expenses | (539) | (301) | (1,271) | (742) |
Interest expense | (3,479) | (2,226) | (8,973) | (6,650) |
Interest income | 161 | 157 | 518 | 515 |
Income from continuing operations before income taxes | 82,746 | 67,897 | 225,513 | 196,864 |
Total assets | 3,894,953 |  | 3,894,953 |  | $ 3,542,657
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (26,482) | (23,286) | (74,938) | (56,526) |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (23,516) | (15,912) | (67,431) | (52,031) |
Total assets | 555,508 |  | 555,508 |  | 536,993
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 1,850,138 | 1,602,127 | 5,350,304 | 4,665,364 |
Total revenues | 1,850,138 | 1,602,127 | 5,350,304 | 4,665,364 |
Operating income (loss) | 107,528 | 82,821 | 293,510 | 247,202 |
Total assets | 3,230,609 |  | 3,230,609 |  | 2,871,882
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 458,553 | 344,389 | 1,227,474 | 1,009,585 |
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 697,733 | 587,522 | 1,939,518 | 1,652,551 |
UNITED STATES | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 454,800 | 428,270 | 1,353,248 | 1,303,389 |
UNITED STATES | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 239,052 | 241,946 | 830,064 | 699,839 |
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 465,476 | 348,327 | 1,249,681 | 1,016,013 |
Operating income (loss) | 30,927 | 25,528 | 70,645 | 67,479 |
Restructuring expenses |  |  | 0 |  |
Total assets | 623,446 |  | 623,446 |  | 372,525
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 702,464 | 592,077 | 1,950,814 | 1,663,259 |
Operating income (loss) | 39,447 | 26,926 | 101,504 | 80,191 |
Restructuring expenses |  |  | (401) | (6) |
Total assets | 929,994 |  | 929,994 |  | 894,366
UNITED STATES | Operating Segments [Member] | United States Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 469,191 | 442,674 | 1,393,636 | 1,341,392 |
Operating income (loss) | 22,568 | 16,027 | 54,761 | 54,944 |
Restructuring expenses |  |  | (870) | (842) |
Total assets | 778,507 |  | 778,507 |  | 721,653
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 239,489 | 242,335 | 831,111 | 701,226 |
Operating income (loss) | 14,586 | 14,340 | 66,600 | 44,588 |
Total assets | 898,662 |  | 898,662 |  | 883,338
UNITED KINGDOM | United Kingdom Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from unrelated entities | 73,036 | 97,001 | 251,256 | 275,536 |
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 73,036 | 97,001 | 251,256 | 275,536 |
Operating income (loss) | 2,591 | $ 3,358 | 9,160 | $ 8,570 |
Total assets | $ 108,836 |  | $ 108,836 |  | $ 133,782

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