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Segment Information (Tables)
9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Information About Industry Segments And Geographic Areas The following tables present information about industry segments and geographic areas for the three and nine months ended September 30, 2018 and 2017 (in thousands): 
 
For the three months ended September 30,
 
2018
 
2017
Revenues from unrelated entities:
 
 
 
United States electrical construction and facilities services
$
485,974

 
$
457,919

United States mechanical construction and facilities services
772,332

 
760,084

United States building services
473,701

 
437,107

United States industrial services
214,476

 
145,679

Total United States operations
1,946,483

 
1,800,789

United Kingdom building services
100,566

 
85,902

Total worldwide operations
$
2,047,049

 
$
1,886,691

 
 
 
 
Total revenues:
 
 
 
United States electrical construction and facilities services
$
486,642

 
$
460,066

United States mechanical construction and facilities services
783,454

 
767,398

United States building services
490,624

 
451,396

United States industrial services
214,650

 
147,133

Less intersegment revenues
(28,887
)
 
(25,204
)
Total United States operations
1,946,483

 
1,800,789

United Kingdom building services
100,566

 
85,902

Total worldwide operations
$
2,047,049

 
$
1,886,691


 
For the nine months ended September 30,
 
2018
 
2017
Revenues from unrelated entities:
 
 
 
United States electrical construction and facilities services
$
1,420,268

 
$
1,350,157

United States mechanical construction and facilities services
2,211,836

 
2,173,030

United States building services
1,389,486

 
1,315,401

United States industrial services
566,770

 
591,694

Total United States operations
5,588,360

 
5,430,282

United Kingdom building services
312,963

 
244,078

Total worldwide operations
$
5,901,323

 
$
5,674,360

 
 
 
 
Total revenues:
 
 
 
United States electrical construction and facilities services
$
1,425,190

 
$
1,355,206

United States mechanical construction and facilities services
2,239,660

 
2,197,231

United States building services
1,437,498

 
1,360,189

United States industrial services
568,238

 
593,648

Less intersegment revenues
(82,226
)
 
(75,992
)
Total United States operations
5,588,360

 
5,430,282

United Kingdom building services
312,963

 
244,078

Total worldwide operations
$
5,901,323

 
$
5,674,360


 
For the three months ended September 30,
 
2018
 
2017
Operating income (loss):
 
 
 
United States electrical construction and facilities services
$
34,473

 
$
46,583

United States mechanical construction and facilities services
58,689

 
57,503

United States building services
29,315

 
26,035

United States industrial services
8,184

 
(4,844
)
Total United States operations
130,661

 
125,277

United Kingdom building services
4,457

 
3,445

Corporate administration
(23,113
)
 
(22,632
)
Restructuring expenses
(229
)
 
(46
)
Total worldwide operations
111,776

 
106,044

Other corporate items:
 
 
 
Net periodic pension (cost) income
615

 
415

Interest expense
(3,588
)
 
(3,324
)
Interest income
852

 
277

Income from continuing operations before income taxes
$
109,655

 
$
103,412


 
For the nine months ended September 30,
 
2018
 
2017
Operating income (loss):
 
 
 
United States electrical construction and facilities services
$
106,309

 
$
109,735

United States mechanical construction and facilities services
155,864

 
151,028

United States building services
68,822

 
60,537

United States industrial services
12,721

 
16,573

Total United States operations
343,716

 
337,873

United Kingdom building services
12,828

 
7,681

Corporate administration
(65,508
)
 
(63,755
)
Restructuring expenses
(693
)
 
(954
)
Impairment loss on identifiable intangible assets
(907
)
 

Total worldwide operations
289,436

 
280,845

Other corporate items:
 
 
 
Net periodic pension (cost) income
2,069

 
1,209

Interest expense
(10,041
)
 
(9,464
)
Interest income
2,030

 
607

Income from continuing operations before income taxes
$
283,494

 
$
273,197



 
September 30,
2018
 
December 31,
2017
Total assets:
 
 
 
United States electrical construction and facilities services
$
650,693

 
$
617,471

United States mechanical construction and facilities services
1,109,064

 
1,097,240

United States building services
830,019

 
764,085

United States industrial services
803,011

 
772,899

Total United States operations
3,392,787

 
3,251,695

United Kingdom building services
143,881

 
131,806

Corporate administration
459,225

 
582,403

Total worldwide operations
$
3,995,893

 
$
3,965,904