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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities | $ 1,777,826 | $ 1,699,128 | $ 1,652,585 | $ 1,589,187 | $ 1,714,796 | $ 1,566,711 | $ 1,552,919 | $ 1,590,539 | $ 6,718,726 | $ 6,424,965 | $ 6,333,527
Total revenues |  |  |  |  |  |  |  |  | 6,718,726 | 6,424,965 | 6,333,527
Operating income (loss) |  |  |  |  |  |  |  |  | 287,082 | 289,878 | 240,350
Restructuring expenses |  |  |  |  |  |  |  |  | (824) | (1,168) | (647)
Impairment loss on identifiable intangible assets | 0 | 0 | 0 | 0 | 1,471 | 0 | 0 | 0 | 0 | 1,471 | 0
Gain on sale of building | 0 | $ 0 | $ 0 | $ 0 | 0 | $ 11,749 | 0 | $ 0 | 0 | 11,749 | 0
Interest expense |  |  |  |  |  |  |  |  | (8,932) | (9,075) | (8,769)
Interest income |  |  |  |  |  |  |  |  | 673 | 842 | 1,128
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 278,823 | 281,645 | 232,709
Capital expenditures |  |  |  |  |  |  |  |  | 35,460 | 38,035 | 35,497
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 36,294 | 36,524 | 36,310
Costs and estimated earnings in excess of billings on uncompleted contracts | 117,734 |  |  |  | 103,201 |  |  |  | 117,734 | 103,201 | 90,727
Billings in excess of costs and estimated earnings on uncompleted contracts | 429,235 |  |  |  | 368,555 |  |  |  | 429,235 | 368,555 | 381,295
Long-lived assets | 1,438,022 |  |  |  | 1,458,340 |  |  |  | 1,438,022 | 1,458,340 | 1,499,736
Total assets | 3,546,470 |  |  |  | 3,388,967 |  |  |  | 3,546,470 | 3,388,967 | 3,465,915
Settlement of contract claim | 12,100 |  |  |  |  |  |  |  | 12,100 | 0 |
Income from reduction in estimate of certain accrued contract costs |  |  |  |  |  |  | $ 4,800 |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  |  |  |  | 2,600
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 6,341,249 | 6,074,521 | 5,989,975
Total revenues |  |  |  |  |  |  |  |  | 6,341,249 | 6,074,521 | 5,989,975
Operating income (loss) |  |  |  |  |  |  |  |  | 347,914 | 334,335 | 297,867
Capital expenditures |  |  |  |  |  |  |  |  | 29,714 | 35,030 | 32,890
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 31,763 | 32,336 | 30,989
Costs and estimated earnings in excess of billings on uncompleted contracts | 109,653 |  |  |  | 94,743 |  |  |  | 109,653 | 94,743 | 82,754
Billings in excess of costs and estimated earnings on uncompleted contracts | 423,966 |  |  |  | 353,980 |  |  |  | 423,966 | 353,980 | 356,064
Long-lived assets | 1,425,552 |  |  |  | 1,449,418 |  |  |  | 1,425,552 | 1,449,418 | 1,489,009
Total assets | 2,871,882 |  |  |  | 2,816,306 |  |  |  | 2,871,882 | 2,816,306 | 2,822,699
UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,367,142 | 1,311,988 | 1,345,750
UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 2,312,763 | 2,201,212 | 2,329,834
UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,739,259 | 1,721,341 | 1,794,978
UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 922,085 | 839,980 | 519,413
UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 377,477 | 350,444 | 343,552
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,378,620 | 1,326,547 | 1,371,979
Operating income (loss) |  |  |  |  |  |  |  |  | 82,225 | 90,873 | 98,114
Restructuring expenses |  |  |  |  |  |  |  |  |  | (638) |
Capital expenditures |  |  |  |  |  |  |  |  | 6,063 | 6,671 | 6,164
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 4,676 | 4,237 | 3,640
Costs and estimated earnings in excess of billings on uncompleted contracts | 39,116 |  |  |  | 32,464 |  |  |  | 39,116 | 32,464 | 28,988
Billings in excess of costs and estimated earnings on uncompleted contracts | 139,857 |  |  |  | 114,422 |  |  |  | 139,857 | 114,422 | 118,458
Long-lived assets | 20,139 |  |  |  | 18,792 |  |  |  | 20,139 | 18,792 | 16,512
Total assets | 372,525 |  |  |  | 332,150 |  |  |  | 372,525 | 332,150 | 329,742
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,326,683 | 2,219,886 | 2,387,072
Operating income (loss) |  |  |  |  |  |  |  |  | 138,688 | 114,418 | 93,765
Restructuring expenses |  |  |  |  |  |  |  |  | (6) | (230) |
Capital expenditures |  |  |  |  |  |  |  |  | 5,345 | 8,631 | 8,866
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 7,624 | 7,600 | 7,280
Costs and estimated earnings in excess of billings on uncompleted contracts | 46,220 |  |  |  | 43,443 |  |  |  | 46,220 | 43,443 | 38,804
Billings in excess of costs and estimated earnings on uncompleted contracts | 238,463 |  |  |  | 199,983 |  |  |  | 238,463 | 199,983 | 205,974
Long-lived assets | 296,633 |  |  |  | 288,161 |  |  |  | 296,633 | 288,161 | 293,790
Total assets | 894,366 |  |  |  | 793,056 |  |  |  | 894,366 | 793,056 | 795,256
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,794,086 | 1,762,697 | 1,839,129
Operating income (loss) |  |  |  |  |  |  |  |  | 70,532 | 65,885 | 67,225
Restructuring expenses |  |  |  |  |  |  |  |  | (924) | 0 |
Capital expenditures |  |  |  |  |  |  |  |  | 7,233 | 10,589 | 7,579
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 9,834 | 10,660 | 11,288
Costs and estimated earnings in excess of billings on uncompleted contracts | 20,959 |  |  |  | 18,555 |  |  |  | 20,959 | 18,555 | 14,957
Billings in excess of costs and estimated earnings on uncompleted contracts | 44,476 |  |  |  | 38,059 |  |  |  | 44,476 | 38,059 | 30,827
Long-lived assets | 378,367 |  |  |  | 392,364 |  |  |  | 378,367 | 392,364 | 406,498
Total assets | 721,653 |  |  |  | 737,082 |  |  |  | 721,653 | 737,082 | 756,785
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 923,648 | 842,040 | 522,417
Operating income (loss) |  |  |  |  |  |  |  |  | 56,469 | 63,159 | 38,763
Capital expenditures |  |  |  |  |  |  |  |  | 11,073 | 9,139 | 10,281
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 9,629 | 9,839 | 8,781
Costs and estimated earnings in excess of billings on uncompleted contracts | 3,358 |  |  |  | 281 |  |  |  | 3,358 | 281 | 5
Billings in excess of costs and estimated earnings on uncompleted contracts | 1,170 |  |  |  | 1,516 |  |  |  | 1,170 | 1,516 | 805
Long-lived assets | 730,413 |  |  |  | 750,101 |  |  |  | 730,413 | 750,101 | 772,209
Total assets | 883,338 |  |  |  | 954,018 |  |  |  | 883,338 | 954,018 | 940,916
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 377,477 | 350,444 | 343,552
Operating income (loss) |  |  |  |  |  |  |  |  | 11,634 | 15,011 | 13,021
Capital expenditures |  |  |  |  |  |  |  |  | 5,298 | 1,935 | 1,536
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 3,603 | 3,305 | 4,477
Costs and estimated earnings in excess of billings on uncompleted contracts | 8,081 |  |  |  | 8,458 |  |  |  | 8,081 | 8,458 | 7,973
Billings in excess of costs and estimated earnings on uncompleted contracts | 5,269 |  |  |  | 14,575 |  |  |  | 5,269 | 14,575 | 25,231
Long-lived assets | 10,927 |  |  |  | 6,899 |  |  |  | 10,927 | 6,899 | 8,831
Total assets | 133,782 |  |  |  | 130,340 |  |  |  | 133,782 | 130,340 | 160,828
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (71,642) | (68,578) | (69,891)
Restructuring expenses |  |  |  |  |  |  |  |  | 0 | (300) |
Capital expenditures |  |  |  |  |  |  |  |  | 448 | 1,070 | 1,071
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 928 | 883 | 844
Long-lived assets | 1,543 |  |  |  | 2,023 |  |  |  | 1,543 | 2,023 | 1,896
Total assets | $ 540,806 |  |  |  | $ 442,321 |  |  |  | 540,806 | 442,321 | 482,388
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ (81,788) | $ (76,649) | $ (130,622)

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