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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities | $ 2,229,308,000 | $ 2,047,049,000 | $ 1,953,886,000 | $ 1,900,388,000 | $ 2,012,639,000 | $ 1,886,691,000 | $ 1,895,937,000 | $ 1,891,732,000 | $ 8,130,631,000 | $ 7,686,999,000 | $ 7,551,524,000
Total revenues |  |  |  |  |  |  |  |  | 8,130,631,000 | 7,686,999,000 | 7,551,524,000
Operating income (loss) |  |  |  |  |  |  |  |  | 403,083,000 | 328,902,000 | 306,929,000
Net periodic pension (cost) income |  |  |  |  |  |  |  |  | 2,743,000 | 1,652,000 | 1,529,000
Restructuring expenses |  |  |  |  |  |  |  |  | (2,306,000) | (1,577,000) | (1,438,000)
Impairment loss on goodwill and identifiable intangible assets |  |  |  |  |  |  |  |  | (907,000) | (57,819,000) | (2,428,000)
Interest expense |  |  |  |  |  |  |  |  | (13,544,000) | (12,770,000) | (12,627,000)
Interest income |  |  |  |  |  |  |  |  | 2,746,000 | 965,000 | 663,000
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 395,028,000 | 318,749,000 | 296,494,000
Capital expenditures |  |  |  |  |  |  |  |  | 43,479,000 | 34,684,000 | 39,648,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 38,472,000 | 39,915,000 | 38,881,000
Contract assets | 158,243,000 |  |  |  | 122,621,000 |  |  |  | 158,243,000 | 122,621,000 | 130,697,000
Contract liabilities | 552,290,000 |  |  |  | 524,156,000 |  |  |  | 552,290,000 | 524,156,000 | 489,242,000
Long-lived assets | 1,613,524,000 |  |  |  | 1,587,085,000 |  |  |  | 1,613,524,000 | 1,587,085,000 | 1,594,977,000
Total assets | 4,088,807,000 |  |  |  | 3,965,904,000 |  |  |  | 4,088,807,000 | 3,965,904,000 | 3,852,438,000
Loss on contracts |  |  |  |  |  |  |  |  |  | 0 |
United States electrical construction and facilities services segment | Transportation Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on contracts |  |  |  |  |  |  |  |  | 10,000,000 |  | 19,400,000
United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement of contract claim |  |  |  |  |  |  |  |  |  | 18,100,000 |
United States Mechanical Construction And Facilities Services | Manufacturing Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on contracts |  |  |  |  |  |  |  |  |  |  | 18,300,000
United States Mechanical Construction And Facilities Services | Institutional Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on contracts |  |  |  |  |  |  |  |  |  |  | 9,600,000
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 7,715,760,000 | 7,346,254,000 | 7,225,268,000
Total revenues |  |  |  |  |  |  |  |  | 7,715,760,000 | 7,346,254,000 | 7,225,268,000
Operating income (loss) |  |  |  |  |  |  |  |  | 480,781,000 | 463,201,000 | 389,449,000
Capital expenditures |  |  |  |  |  |  |  |  | 42,297,000 | 31,903,000 | 34,111,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 34,291,000 | 35,689,000 | 34,497,000
Contract assets | 135,135,000 |  |  |  | 115,105,000 |  |  |  | 135,135,000 | 115,105,000 | 123,552,000
Contract liabilities | 536,385,000 |  |  |  | 520,249,000 |  |  |  | 536,385,000 | 520,249,000 | 487,974,000
Long-lived assets | 1,603,188,000 |  |  |  | 1,573,862,000 |  |  |  | 1,603,188,000 | 1,573,862,000 | 1,581,797,000
Total assets | 3,493,784,000 |  |  |  | 3,251,695,000 |  |  |  | 3,493,784,000 | 3,251,695,000 | 3,190,082,000
UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,954,323,000 | 1,829,567,000 | 1,704,403,000
UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 3,020,307,000 | 2,963,815,000 | 2,643,321,000
UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,875,485,000 | 1,753,703,000 | 1,810,229,000
UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 865,645,000 | 799,169,000 | 1,067,315,000
UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 414,871,000 | 340,745,000 | 326,256,000
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,957,819,000 |  |
Total revenues |  |  |  |  |  |  |  |  | 1,959,978,000 | 1,836,985,000 | 1,728,920,000
Operating income (loss) |  |  |  |  |  |  |  |  | 139,430,000 | 150,001,000 | 101,761,000
Restructuring expenses |  |  |  |  |  |  |  |  | 0 | (452,000) |
Capital expenditures |  |  |  |  |  |  |  |  | 5,993,000 | 4,797,000 | 5,294,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 6,221,000 | 6,545,000 | 6,318,000
Contract assets | 38,412,000 |  |  |  | 35,060,000 |  |  |  | 38,412,000 | 35,060,000 | 46,193,000
Contract liabilities | 163,951,000 |  |  |  | 178,454,000 |  |  |  | 163,951,000 | 178,454,000 | 163,794,000
Long-lived assets | 201,333,000 |  |  |  | 180,990,000 |  |  |  | 201,333,000 | 180,990,000 | 183,632,000
Total assets | 702,112,000 |  |  |  | 617,471,000 |  |  |  | 702,112,000 | 617,471,000 | 631,581,000
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 3,038,665,000 |  |
Total revenues |  |  |  |  |  |  |  |  | 3,061,832,000 | 2,994,700,000 | 2,662,100,000
Operating income (loss) |  |  |  |  |  |  |  |  | 219,352,000 | 212,396,000 | 132,743,000
Restructuring expenses |  |  |  |  |  |  |  |  | 0 | (180,000) |
Capital expenditures |  |  |  |  |  |  |  |  | 7,613,000 | 6,778,000 | 7,672,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 8,104,000 | 7,819,000 | 7,544,000
Contract assets | 50,463,000 |  |  |  | 52,381,000 |  |  |  | 50,463,000 | 52,381,000 | 46,703,000
Contract liabilities | 285,103,000 |  |  |  | 290,216,000 |  |  |  | 285,103,000 | 290,216,000 | 271,811,000
Long-lived assets | 346,977,000 |  |  |  | 352,970,000 |  |  |  | 346,977,000 | 352,970,000 | 287,744,000
Total assets | 1,113,417,000 |  |  |  | 1,097,240,000 |  |  |  | 1,113,417,000 | 1,097,240,000 | 954,633,000
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,942,663,000 | 1,812,763,000 | 1,864,824,000
Operating income (loss) |  |  |  |  |  |  |  |  | 93,827,000 | 81,720,000 | 77,100,000
Restructuring expenses |  |  |  |  |  |  |  |  | (882,000) | (945,000) |
Capital expenditures |  |  |  |  |  |  |  |  | 10,414,000 | 10,745,000 | 11,080,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 10,324,000 | 11,051,000 | 10,241,000
Contract assets | 33,304,000 |  |  |  | 26,028,000 |  |  |  | 33,304,000 | 26,028,000 | 28,084,000
Contract liabilities | 79,281,000 |  |  |  | 48,481,000 |  |  |  | 79,281,000 | 48,481,000 | 50,546,000
Long-lived assets | 436,887,000 |  |  |  | 409,718,000 |  |  |  | 436,887,000 | 409,718,000 | 401,154,000
Total assets | 846,221,000 |  |  |  | 764,085,000 |  |  |  | 846,221,000 | 764,085,000 | 753,434,000
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 867,810,000 | 801,531,000 | 1,068,662,000
Operating income (loss) |  |  |  |  |  |  |  |  | 28,172,000 | 19,084,000 | 77,845,000
Capital expenditures |  |  |  |  |  |  |  |  | 18,277,000 | 9,583,000 | 10,065,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 9,642,000 | 10,274,000 | 10,394,000
Contract assets | 12,956,000 |  |  |  | 1,636,000 |  |  |  | 12,956,000 | 1,636,000 | 2,572,000
Contract liabilities | 8,050,000 |  |  |  | 3,098,000 |  |  |  | 8,050,000 | 3,098,000 | 1,823,000
Long-lived assets | 617,991,000 |  |  |  | 630,184,000 |  |  |  | 617,991,000 | 630,184,000 | 709,267,000
Total assets | 832,034,000 |  |  |  | 772,899,000 |  |  |  | 832,034,000 | 772,899,000 | 850,434,000
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 414,871,000 | 340,745,000 | 326,256,000
Operating income (loss) |  |  |  |  |  |  |  |  | 15,930,000 | 12,905,000 | 10,086,000
Capital expenditures |  |  |  |  |  |  |  |  | 870,000 | 2,166,000 | 4,523,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 3,447,000 | 3,371,000 | 3,560,000
Contract assets | 23,108,000 |  |  |  | 7,516,000 |  |  |  | 23,108,000 | 7,516,000 | 7,145,000
Contract liabilities | 15,905,000 |  |  |  | 3,907,000 |  |  |  | 15,905,000 | 3,907,000 | 1,268,000
Long-lived assets | 9,264,000 |  |  |  | 11,729,000 |  |  |  | 9,264,000 | 11,729,000 | 11,446,000
Total assets | 146,379,000 |  |  |  | 131,806,000 |  |  |  | 146,379,000 | 131,806,000 | 105,081,000
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (90,415,000) | (87,808,000) | (88,740,000)
Restructuring expenses |  |  |  |  |  |  |  |  | (1,424,000) | 0 |
Capital expenditures |  |  |  |  |  |  |  |  | 312,000 | 615,000 | 1,014,000
Depreciation and amortization of Property, plant and equipment |  |  |  |  |  |  |  |  | 734,000 | 855,000 | 824,000
Long-lived assets | 1,072,000 |  |  |  | 1,494,000 |  |  |  | 1,072,000 | 1,494,000 | 1,734,000
Total assets | $ 448,644,000 |  |  |  | $ 582,403,000 |  |  |  | 448,644,000 | 582,403,000 | 557,275,000
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (116,523,000) | $ (99,725,000) | $ (99,238,000)
Intersegment Eliminations [Member] | UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | (3,496,000) |  |
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | $ (18,358,000) |  |

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