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Commitments and Contingencies Restructuring and Related Activities (Tables)
9 Months Ended
Sep. 30, 2018
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost The changes in restructuring activity by reportable segments during the nine months ended September 30, 2018 and 2017 were as follows (in thousands):    
 
 
United States
electrical
construction
and facilities
services segment
 
United States
mechanical
construction
and facilities
services segment
 
United States building services segment
 
Total
Balance at December 31, 2016
 
$

 
$
188

 
$
13

 
$
201

Charges
 

 
181

 
773

 
954

Payments
 

 
(369
)
 
(737
)
 
(1,106
)
Balance at September 30, 2017
 
$

 
$

 
$
49

 
$
49

Balance at December 31, 2017
 
$
452

 
$

 
$
40

 
$
492

Charges
 

 

 
693

 
693

Payments
 
(330
)
 

 
(646
)
 
(976
)
Balance at September 30, 2018
 
$
122

 
$

 
$
87

 
$
209