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Commitments and Contingencies Restructuring and Related Activities (Tables)
 3 Months Ended
Mar. 31, 2020
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost
The changes in restructuring activity by reportable segment during the three months ended March 31, 2020 and 2019 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, 2018
 
$
30

 
$
176

 
$
1,424

 
$
1,630

Charges
 
—

 
275

 
—

 
275

Payments
 
(30
)
 
(381
)
 
(30
)
 
(441
)
Balance at March 31, 2019
 
$
—

 
$
70

 
$
1,394

 
$
1,464

Balance at December 31, 2019
 
$
445

 
$
412

 
$
701

 
$
1,558

Charges
 
—

 
69

 
—

 
69

Payments
 
(89
)
 
(481
)
 
—

 
(570
)
Balance at March 31, 2020
 
$
356

 
$
—

 
$
701

 
$
1,057