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REVENUE (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 100.00% 100.00% 100.00% 100.00%
Service Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Percent of Total Company Revenue 1.00%   1.00%  
Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 17.00% 15.00% 16.00% 14.00%
Heavy Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 17.00% 15.00% 17.00%
Light Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 10.00% 10.00% 11.00%
Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 4.00% 5.00% 5.00% 5.00%
Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 5.00% 7.00% 5.00%
Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 8.00% 7.00% 8.00%
Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 7.00% 8.00% 7.00%
Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 8.00% 7.00% 8.00%
Natural Resources [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 3.00% 4.00% 3.00% 4.00%
Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 23.00% 21.00% 22.00% 21.00%
Other Segments [Member]        
Disaggregation of Revenue [Line Items]        
Percent of Total Company Revenue 23.00% 23.00% 23.00% 22.00%
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 73.00% 73.00% 73.00% 73.00%
United States [Member] | Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 23.00% 20.00% 22.00% 19.00%
United States [Member] | Heavy Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 15.00% 18.00% 16.00% 19.00%
United States [Member] | Light Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 12.00% 12.00% 13.00% 13.00%
United States [Member] | Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 5.00% 6.00% 5.00% 5.00%
United States [Member] | Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 7.00% 10.00% 7.00%
United States [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 10.00% 8.00% 10.00%
United States [Member] | Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 10.00% 9.00% 10.00% 8.00%
United States [Member] | Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 9.00% 9.00% 9.00% 10.00%
United States [Member] | Natural Resources [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 2.00% 3.00% 2.00% 3.00%
United States [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 7.00% 6.00% 5.00% 6.00%
Canada [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 100.00% 100.00% 100.00% 100.00%
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage Of Company-Wide Revenue 4.00% 4.00% 4.00% 5.00%
Canada [Member] | Government Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 5.00% 9.00% 6.00%
Canada [Member] | Heavy Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 19.00% 20.00% 18.00% 20.00%
Canada [Member] | Light Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 6.00% 6.00% 6.00% 6.00%
Canada [Member] | Transportation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 8.00% 8.00% 9.00% 8.00%
Canada [Member] | Healthcare Customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 0.00% 0.00% 0.00% 0.00%
Canada [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 11.00% 9.00% 10.00% 9.00%
Canada [Member] | Retail/Wholesale [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 3.00% 4.00% 4.00% 4.00%
Canada [Member] | Contractors [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 11.00% 11.00% 10.00% 11.00%
Canada [Member] | Natural Resources [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 29.00% 33.00% 29.00% 32.00%
Canada [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage 5.00% 4.00% 5.00% 4.00%