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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities | $ 2,403,940,000 | $ 2,287,741,000 | $ 2,324,202,000 | $ 2,158,728,000 | $ 2,229,308,000 | $ 2,047,049,000 | $ 1,953,886,000 | $ 1,900,388,000 | $ 9,174,611,000 | $ 8,130,631,000 | $ 7,686,999,000
Total revenues |  |  |  |  |  |  |  |  | 9,174,611,000 | 8,130,631,000 | 7,686,999,000
Operating income (loss) |  |  |  |  |  |  |  |  | 460,892,000 | 403,083,000 | 328,902,000
Restructuring expenses |  |  |  |  |  |  |  |  | (1,523,000) | (2,306,000) | (1,577,000)
Impairment loss on goodwill and identifiable intangible assets |  |  |  |  |  |  |  |  | 0 | (907,000) | (57,819,000)
Net periodic pension (cost) income |  |  |  |  |  |  |  |  | 1,553,000 | 2,743,000 | 1,652,000
Interest expense |  |  |  |  |  |  |  |  | (13,821,000) | (13,544,000) | (12,770,000)
Interest income |  |  |  |  |  |  |  |  | 2,265,000 | 2,746,000 | 965,000
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 450,889,000 | 395,028,000 | 318,749,000
Capital expenditures |  |  |  |  |  |  |  |  | 48,432,000 | 43,479,000 | 34,684,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 43,945,000 | 38,472,000 | 39,915,000
Contract assets | 177,830,000 |  |  |  | 158,243,000 |  |  |  | 177,830,000 | 158,243,000 | 122,621,000
Contract liabilities | 623,642,000 |  |  |  | 552,290,000 |  |  |  | 623,642,000 | 552,290,000 | 524,156,000
Long-lived assets | 1,831,542,000 |  |  |  | 1,613,524,000 |  |  |  | 1,831,542,000 | 1,613,524,000 | 1,587,085,000
Total assets | 4,830,358,000 |  |  |  | 4,088,807,000 |  |  |  | 4,830,358,000 | 4,088,807,000 | 3,965,904,000
Loss on contracts |  |  |  |  |  |  |  |  | 0 |  |
United States electrical construction and facilities services segment | Transportation Sector [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on contracts |  |  |  |  |  |  |  |  |  | 10,000,000.0 |
United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement of contract claim |  |  |  |  |  |  |  |  |  |  | 18,100,000
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 8,751,352,000 | 7,715,760,000 | 7,346,254,000
Total revenues |  |  |  |  |  |  |  |  | 8,751,352,000 | 7,715,760,000 | 7,346,254,000
Operating income (loss) |  |  |  |  |  |  |  |  | 545,818,000 | 480,781,000 | 463,201,000
Capital expenditures |  |  |  |  |  |  |  |  | 43,859,000 | 42,297,000 | 31,903,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 40,196,000 | 34,291,000 | 35,689,000
Contract assets | 152,286,000 |  |  |  | 135,135,000 |  |  |  | 152,286,000 | 135,135,000 | 115,105,000
Contract liabilities | 601,042,000 |  |  |  | 536,385,000 |  |  |  | 601,042,000 | 536,385,000 | 520,249,000
Long-lived assets | 1,820,489,000 |  |  |  | 1,603,188,000 |  |  |  | 1,820,489,000 | 1,603,188,000 | 1,573,862,000
Total assets | 4,197,584,000 |  |  |  | 3,493,784,000 |  |  |  | 4,197,584,000 | 3,493,784,000 | 3,251,695,000
UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 2,216,600,000 | 1,954,323,000 | 1,829,567,000
UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 3,340,337,000 | 2,962,843,000 | 2,880,148,000
UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 2,106,872,000 | 1,875,485,000 | 1,753,703,000
UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 1,087,543,000 | 923,109,000 | 882,836,000
UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 423,259,000 | 414,871,000 | 340,745,000
Operating Segments [Member] | UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 2,219,974,000 | 1,957,819,000 |
Total revenues |  |  |  |  |  |  |  |  | 2,220,582,000 | 1,959,978,000 | 1,836,985,000
Operating income (loss) |  |  |  |  |  |  |  |  | 161,684,000 | 139,430,000 | 150,001,000
Restructuring expenses |  |  |  |  |  |  |  |  | (445,000) | 0 |
Capital expenditures |  |  |  |  |  |  |  |  | 5,876,000 | 5,993,000 | 4,797,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 7,550,000 | 6,221,000 | 6,545,000
Contract assets | 50,813,000 |  |  |  | 38,412,000 |  |  |  | 50,813,000 | 38,412,000 | 35,060,000
Contract liabilities | 173,967,000 |  |  |  | 163,951,000 |  |  |  | 173,967,000 | 163,951,000 | 178,454,000
Long-lived assets | 215,780,000 |  |  |  | 201,333,000 |  |  |  | 215,780,000 | 201,333,000 | 180,990,000
Total assets | 834,802,000 |  |  |  | 702,112,000 |  |  |  | 834,802,000 | 702,112,000 | 617,471,000
Operating Segments [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | 3,351,918,000 | 2,975,751,000 |
Total revenues |  |  |  |  |  |  |  |  | 3,370,960,000 | 2,998,918,000 | 2,911,033,000
Operating income (loss) |  |  |  |  |  |  |  |  | 225,040,000 | 219,853,000 | 192,167,000
Capital expenditures |  |  |  |  |  |  |  |  | 7,890,000 | 7,504,000 | 6,665,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 8,764,000 | 7,803,000 | 7,504,000
Contract assets | 61,225,000 |  |  |  | 49,302,000 |  |  |  | 61,225,000 | 49,302,000 | 50,302,000
Contract liabilities | 317,083,000 |  |  |  | 280,846,000 |  |  |  | 317,083,000 | 280,846,000 | 288,699,000
Long-lived assets | 530,561,000 |  |  |  | 334,628,000 |  |  |  | 530,561,000 | 334,628,000 | 340,030,000
Total assets | 1,536,325,000 |  |  |  | 1,081,005,000 |  |  |  | 1,536,325,000 | 1,081,005,000 | 1,071,164,000
Operating Segments [Member] | UNITED STATES | United States Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,182,390,000 | 1,942,663,000 | 1,812,763,000
Operating income (loss) |  |  |  |  |  |  |  |  | 114,754,000 | 93,827,000 | 81,720,000
Restructuring expenses |  |  |  |  |  |  |  |  | (1,078,000) | (882,000) |
Capital expenditures |  |  |  |  |  |  |  |  | 14,291,000 | 10,414,000 | 10,745,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 12,728,000 | 10,324,000 | 11,051,000
Contract assets | 30,428,000 |  |  |  | 33,304,000 |  |  |  | 30,428,000 | 33,304,000 | 26,028,000
Contract liabilities | 97,588,000 |  |  |  | 79,281,000 |  |  |  | 97,588,000 | 79,281,000 | 48,481,000
Long-lived assets | 458,915,000 |  |  |  | 436,887,000 |  |  |  | 458,915,000 | 436,887,000 | 409,718,000
Total assets | 996,664,000 |  |  |  | 846,221,000 |  |  |  | 996,664,000 | 846,221,000 | 764,085,000
Operating Segments [Member] | UNITED STATES | United States Industrial Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,111,264,000 | 930,724,000 | 885,198,000
Operating income (loss) |  |  |  |  |  |  |  |  | 44,340,000 | 27,671,000 | 39,313,000
Capital expenditures |  |  |  |  |  |  |  |  | 15,802,000 | 18,386,000 | 9,696,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 11,154,000 | 9,943,000 | 10,589,000
Contract assets | 9,820,000 |  |  |  | 14,117,000 |  |  |  | 9,820,000 | 14,117,000 | 3,715,000
Contract liabilities | 12,404,000 |  |  |  | 12,307,000 |  |  |  | 12,404,000 | 12,307,000 | 4,615,000
Long-lived assets | 615,233,000 |  |  |  | 630,340,000 |  |  |  | 615,233,000 | 630,340,000 | 643,124,000
Total assets | 829,793,000 |  |  |  | 864,446,000 |  |  |  | 829,793,000 | 864,446,000 | 798,975,000
Operating Segments [Member] | UNITED KINGDOM | United Kingdom Building Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 423,259,000 | 414,871,000 | 340,745,000
Operating income (loss) |  |  |  |  |  |  |  |  | 18,323,000 | 15,930,000 | 12,905,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,598,000 | 870,000 | 2,166,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 2,942,000 | 3,447,000 | 3,371,000
Contract assets | 25,544,000 |  |  |  | 23,108,000 |  |  |  | 25,544,000 | 23,108,000 | 7,516,000
Contract liabilities | 22,600,000 |  |  |  | 15,905,000 |  |  |  | 22,600,000 | 15,905,000 | 3,907,000
Long-lived assets | 9,622,000 |  |  |  | 9,264,000 |  |  |  | 9,622,000 | 9,264,000 | 11,729,000
Total assets | 181,147,000 |  |  |  | 146,379,000 |  |  |  | 181,147,000 | 146,379,000 | 131,806,000
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (101,726,000) | (90,415,000) | (87,808,000)
Restructuring expenses |  |  |  |  |  |  |  |  | 0 | (1,424,000) |
Capital expenditures |  |  |  |  |  |  |  |  | 975,000 | 312,000 | 615,000
Depreciation and amortization of property, plant and equipment |  |  |  |  |  |  |  |  | 807,000 | 734,000 | 855,000
Long-lived assets | 1,431,000 |  |  |  | 1,072,000 |  |  |  | 1,431,000 | 1,072,000 | 1,494,000
Total assets | $ 451,627,000 |  |  |  | $ 448,644,000 |  |  |  | 451,627,000 | 448,644,000 | 582,403,000
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | (133,844,000) | (116,523,000) | $ (99,725,000)
Intersegment Eliminations [Member] | UNITED STATES | United States electrical construction and facilities services segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | (3,374,000) | (3,496,000) |
Intersegment Eliminations [Member] | UNITED STATES | United States Mechanical Construction And Facilities Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from unrelated entities |  |  |  |  |  |  |  |  | $ (11,581,000) | $ (12,908,000) |

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