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Commitments and Contingencies Restructuring and Related Activities (Tables)
9 Months Ended
Sep. 30, 2020
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost
The table below summarizes restructuring activity by reportable segment during the nine months ended September 30, 2020 and 2019 (in thousands):    
United States
electrical
construction
and facilities
services segment
United States
mechanical
construction
and facilities
services segment
United States building services segmentCorporate administrationTotal
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 
Balance at December 31, 2019$445 $— $412 $701 $1,558 
Charges268 268 69 — 605 
Payments(189)— (481)(355)(1,025)
Balance at September 30, 2020$524 $268 $— $346 $1,138