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REVENUE (Details)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 100.00% 100.00%
Government [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 13.00% 13.00%
Heavy Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 18.00% 19.00%
Light Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 11.00% 11.00%
Transportation [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 5.00% 5.00%
Commercial [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 14.00% 13.00%
Retail/Wholesale [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 7.00%
Contractors [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 8.00%
Natural Resources [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 4.00% 4.00%
Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 20.00% 20.00%
Other Segments [Member]    
Disaggregation of Revenue [Line Items]    
Percent of Total Company Revenue 23.00% 21.00%
United States [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 72.00% 72.00%
United States [Member] | Government [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 17.00% 17.00%
United States [Member] | Heavy Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 19.00% 20.00%
United States [Member] | Light Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 13.00% 13.00%
United States [Member] | Transportation [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 5.00%
United States [Member] | Commercial [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 17.00% 16.00%
United States [Member] | Retail/Wholesale [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 8.00%
United States [Member] | Contractors [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 10.00%
United States [Member] | Natural Resources [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 3.00% 3.00%
United States [Member] | Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 8.00%
Canada [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 5.00% 7.00%
Canada [Member] | Government [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 7.00%
Canada [Member] | Heavy Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 21.00% 20.00%
Canada [Member] | Light Manufacturing [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 5.00%
Canada [Member] | Transportation [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 8.00%
Canada [Member] | Commercial [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 10.00%
Canada [Member] | Retail/Wholesale [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 4.00% 4.00%
Canada [Member] | Contractors [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 12.00%
Canada [Member] | Natural Resources [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 32.00% 31.00%
Canada [Member] | Other [Member]    
Disaggregation of Revenue [Line Items]    
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 4.00% 3.00%