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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Organization) (Details) | 6 Months Ended
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Jun. 30, 2018 segment
Organization and description of business |
Number of reportable operating segments | 3
Asset-Based |
Organization and description of business |
Percentage of the Company's revenues, before other revenues and intercompany eliminations, represented by the Asset-Based segment | 69.00%
Estimated increase in compounded annual contractual wage and benefit contribution rates (as a percent) | 2.00%
Asset-Based | Unionized employees concentration risk | Number of employees |
Organization and description of business |
Percentage of Asset-Based segment employees covered under collective bargaining agreement with the IBT | 82.00%

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