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ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Purchase consideration, net of cash acquired |  |  | $ 5,315 | $ 49,068 | $ 220,203
Goodwill recorded in acquisition |  |  |  | $ 28,591 |
Milgram & Company Ltd. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase consideration, net of cash acquired | $ 47,300 |  |  |  |
Goodwill recorded in acquisition | $ 28,300 |  |  |  |
APC Logistics |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire business |  | $ 229,400 |  |  |

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