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Schedule of Restructuring Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve $ 236 $ 172 $ 201 $ 81
Restructuring expenses 565 91    
Payments for restructuring (530) 0    
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses 565 91    
UNITED STATES | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 140 0 188 0
Restructuring expenses 62 0    
Payments for restructuring (110) 0    
UNITED STATES | Operating Segments [Member] | United States Building Services [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve 96 172 $ 13 $ 81
Restructuring expenses 503 91    
Payments for restructuring $ (420) $ 0