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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Product Concentration Risk | Revenue | Transportation services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of revenues attributable to services | 93.00% | 91.00% | 92.00%
Product Concentration Risk | Revenue | Sourcing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of revenues attributable to services | 5.00% | 7.00% | 6.00%
Product Concentration Risk | Revenue | Value-added logistics services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of revenues attributable to services | 2.00% | 2.00% | 2.00%
Maximum |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Typical contract term | 1 year |  |

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