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BUSINESS ACQUISITIONS AND DIVESTITURES (Details) $ in Thousands, £ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2015 GBP (£) | Sep. 01, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Aug. 31, 2015 GBP (£) | Aug. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisitions and Divestitures [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 527,150 | $ 582,336 |  |  | $ 506,905
Reclassification of cumulative currency translation |  |  | $ 0 | $ 0 |  |  | 9,042
Cromwell [Member] |  |  |  |  |  |  |
Business Acquisitions and Divestitures [Line Items] |  |  |  |  |  |  |
Sales reported by acquired entity for last fiscal year |  |  |  |  | £ 285 | $ 437,000 |
Acquisition price | £ 310 | $ 464,000 |  |  |  |  |
Goodwill |  | 123,000 |  |  |  |  |
Cromwell [Member] | Customer relationships [Member] |  |  |  |  |  |  |
Business Acquisitions and Divestitures [Line Items] |  |  |  |  |  |  |
Finite lived intangibles, acquired |  | $ 132,000 |  |  |  |  |
Acquired finite-lived intangible assets, useful life | 15 years | 15 years |  |  |  |  |
Cromwell [Member] | Tradename [Member] |  |  |  |  |  |  |
Business Acquisitions and Divestitures [Line Items] |  |  |  |  |  |  |
Indefinite lived intangibles, acquired |  | $ 84,000 |  |  |  |  |
Grainger Brazil [Member] |  |  |  |  |  |  |
Business Acquisitions and Divestitures [Line Items] |  |  |  |  |  |  |
Shutdown costs |  |  |  |  |  |  | 29,000
Reclassification of cumulative currency translation |  |  |  |  |  |  | $ 9,000

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