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Segment Information (Information About Industry Segments And Geographic Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Revenues from unrelated entities $ 1,652,585 $ 1,552,918 $ 3,241,772 $ 3,143,457  
Total revenues 1,652,585 1,552,918 3,241,772 3,143,457  
Operating income (loss) 77,703 69,659 133,033 141,783  
Restructuring expenses (433) (176) (441) (401)  
Interest expense (2,208) (2,242) (4,424) (4,490)  
Interest income 182 221 358 455  
Income from continuing operations before income taxes 75,677 67,638 128,967 137,748  
Total assets 3,417,786   3,417,786   $ 3,388,967
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total revenues (18,828) (19,670) (33,240) (42,867)  
Corporate, Non-Segment [Member]          
Segment Reporting Information [Line Items]          
Operating income (loss) (17,693) (16,244) (36,119) (31,711)  
Restructuring expenses     0 (300)  
Total assets 401,319   401,319   442,321
UNITED STATES          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 1,561,000 1,469,422 3,063,237 2,970,571  
Total revenues 1,561,000 1,469,422 3,063,237 2,970,571  
Operating income (loss) 92,995 79,877 164,381 164,330  
Total assets 2,873,641   2,873,641   2,816,306
UNITED STATES | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 346,202 335,492 665,196 643,628  
UNITED STATES | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 554,003 538,556 1,065,029 1,051,567  
UNITED STATES | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 435,627 418,142 875,119 866,186  
UNITED STATES | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 225,168 177,232 457,893 409,190  
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 347,448 340,155 667,686 654,952  
Operating income (loss) 25,277 24,841 41,951 46,496  
Restructuring expenses       (182)  
Total assets 365,085   365,085   332,150
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 557,815 543,606 1,071,182 1,062,717  
Operating income (loss) 32,364 28,740 53,265 47,846  
Restructuring expenses     (6)    
Total assets 825,617   825,617   793,056
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 448,990 427,988 898,718 885,952  
Operating income (loss) 17,939 13,920 38,917 34,218  
Restructuring expenses     (541) 0  
Total assets 743,015   743,015   737,082
UNITED STATES | Operating Segments [Member] | United States Industrial Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 225,575 177,343 458,891 409,817  
Operating income (loss) 17,415 12,376 30,248 35,770  
Total assets 939,924   939,924   954,018
UNITED KINGDOM | United Kingdom Building Services [Member]          
Segment Reporting Information [Line Items]          
Revenues from unrelated entities 91,585 83,496 178,535 172,886  
UNITED KINGDOM | Operating Segments [Member] | United Kingdom Building Services [Member]          
Segment Reporting Information [Line Items]          
Total revenues 91,585 83,496 178,535 172,886  
Operating income (loss) 2,834 $ 6,202 5,212 $ 9,565  
Total assets $ 142,826   $ 142,826   $ 130,340