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ACQUISITIONS - ACQUISITIONS (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) branches | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |
Payments to Acquire Businesses, Gross | $ 0 | $ 50,348
Number of Stores | branches | 500 |
Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Mar. 14, 2016 |
Business Acquisition, Name of Acquired Entity | Atlanta Electrical Distributors, LLC |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period | $ 85,000 |
Finite-lived Intangible Assets Acquired | 21,800 |
Goodwill, Acquired During Period | $ 30,000 |
Number of Stores | 5 |
Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 15,800 |
Noncompete Agreements [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 100 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |
Trademarks [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Finite-lived Intangible Assets Acquired | $ 6,000 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |
Minimum [Member] | Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 13 years |
Maximum [Member] | Customer Relationships [Member] | Atlanta Electrical Distributors, LLC (AED) [Member] |  |
Business Acquisition [Line Items] |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |

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