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Commitments and Contingencies Restructuring and Related Activities (Tables)
 9 Months Ended
Sep. 30, 2019
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost
The changes in restructuring activity by reportable segment during the nine months ended September 30, 2019 and 2018 were as follows (in thousands):    
 
 
United States
electrical
construction
and facilities
services segment
 
United States building services segment
 
Corporate administration
 
Total
Balance at December 31, 2017
 
$
452

 
$
40

 
$
—

 
$
492

Charges
 
—

 
693

 
—

 
693

Payments
 
(330
)
 
(646
)
 
—

 
(976
)
Balance at September 30, 2018
 
$
122

 
$
87

 
$
—

 
$
209

Balance at December 31, 2018
 
$
30

 
$
176

 
$
1,424

 
$
1,630

Charges
 
—

 
567

 
—

 
567

Payments
 
(30
)
 
(708
)
 
(723
)
 
(1,461
)
Balance at September 30, 2019
 
$
—

 
$
35

 
$
701

 
$
736