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ACQUISITIONS - Additional Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration. net of cash acquired |  | $ 1,315 | $ 48,446 |
Goodwill |  | $ 1,265,226 |  | $ 1,275,816
Milgram & Company Ltd. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration. net of cash acquired | $ 47,300 |  |  |
Goodwill | $ 28,300 |  |  |

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