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Schedule of Restructuring Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve $ 327 $ 541 $ 327 $ 541 $ 81 $ 281
Restructuring expenses 641 433 732 441    
Payments for restructuring     (486) (181)    
Employee Severance [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses 641 433 732 441    
UNITED STATES | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve 0 0 0 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 [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve 146 0 146 0 0 26
Restructuring expenses     198 6    
Payments for restructuring     (52) (32)    
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve $ 181 $ 541 181 541 $ 81 $ 0
Restructuring expenses     534 541    
Payments for restructuring     $ (434) $ 0