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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)