REVENUE (Details) | 3 Months Ended | 6 Months Ended |
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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% |
Government Customer [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 17.00% | 14.00% | 16.00% | 13.00% |
Heavy Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 15.00% | 17.00% | 16.00% | 18.00% |
Light Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 10.00% | 11.00% | 10.00% | 11.00% |
Transportation [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 5.00% | 5.00% | 5.00% | 5.00% |
Healthcare Customer [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 8.00% | 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 | 21.00% | 21.00% | 21.00% | 21.00% |
Other Segments [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Percent of Total Company Revenue | 24.00% | 23.00% | 24.00% | 23.00% |
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 | 72.00% | 72.00% | 72.00% | 72.00% |
United States [Member] | Government Customer [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 24.00% | 19.00% | 21.00% | 18.00% |
United States [Member] | Heavy Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 15.00% | 19.00% | 17.00% | 19.00% |
United States [Member] | Light Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 13.00% | 13.00% | 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% | 5.00% | 5.00% | 6.00% |
United States [Member] | Healthcare Customer [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 11.00% | 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 | 7.00% | 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% | 8.00% | 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% | 10.00% | 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 | 4.00% | 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% | 5.00% | 4.00% | 5.00% |
Canada [Member] | Government Customer [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 10.00% | 6.00% | 10.00% | 6.00% |
Canada [Member] | Heavy Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 16.00% | 20.00% | 17.00% | 21.00% |
Canada [Member] | Light Manufacturing [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 7.00% | 6.00% | 6.00% | 6.00% |
Canada [Member] | Transportation [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 10.00% | 8.00% | 10.00% | 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 | 10.00% | 9.00% | 9.00% | 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 | 10.00% | 11.00% | 9.00% | 10.00% |
Canada [Member] | Natural Resources [Member] | | | | |
Disaggregation of Revenue [Line Items] | | | | |
Revenue From Contract With Customer, Excluding Assessed Tax, Percentage | 29.00% | 32.00% | 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% | 6.00% | 4.00% |