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Commitments and Contingencies - Schedule of Restructuring Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve $ 201 $ 81 $ 281
Restructuring expenses 1,438 824 1,168
Payments for restructuring (1,318) (1,024)  
Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 1,438 900 600
Facility Closing [Member]      
Restructuring Cost and Reserve [Line Items]      
Reversal of restructuring expenses   (100)  
Restructuring expenses 0   600
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 0 0 255
Reversal of restructuring expenses   (106)  
Restructuring expenses 0    
Payments for restructuring 0 (149)  
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 188 0 26
Restructuring expenses 519 6  
Payments for restructuring (331) (32)  
UNITED STATES | Operating Segments [Member] | United States Building Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 13 81 $ 0
Restructuring expenses 919 924  
Payments for restructuring (987) $ (843)  
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Electrical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 0    
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Mechanical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 519    
UNITED STATES | Operating Segments [Member] | Employee Severance [Member] | United States Building Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 919    
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Electrical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 0    
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Mechanical Construction And Facilities Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses 0    
UNITED STATES | Operating Segments [Member] | Facility Closing [Member] | United States Building Services      
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses $ 0